init
This commit is contained in:
arraykeys
+1252
@@ -0,0 +1,1252 @@
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package fasthttp
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import (
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"bytes"
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"errors"
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"fmt"
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"html"
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"io"
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"io/ioutil"
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"mime"
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"net/http"
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"os"
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"path/filepath"
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"sort"
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"strings"
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"sync"
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"time"
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"github.com/klauspost/compress/gzip"
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)
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// ServeFileBytesUncompressed returns HTTP response containing file contents
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// from the given path.
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//
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// Directory contents is returned if path points to directory.
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//
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// ServeFileBytes may be used for saving network traffic when serving files
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// with good compression ratio.
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//
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// See also RequestCtx.SendFileBytes.
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func ServeFileBytesUncompressed(ctx *RequestCtx, path []byte) {
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ServeFileUncompressed(ctx, b2s(path))
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}
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// ServeFileUncompressed returns HTTP response containing file contents
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// from the given path.
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//
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// Directory contents is returned if path points to directory.
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//
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// ServeFile may be used for saving network traffic when serving files
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// with good compression ratio.
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//
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// See also RequestCtx.SendFile.
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func ServeFileUncompressed(ctx *RequestCtx, path string) {
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ctx.Request.Header.DelBytes(strAcceptEncoding)
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ServeFile(ctx, path)
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}
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// ServeFileBytes returns HTTP response containing compressed file contents
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// from the given path.
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//
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// HTTP response may contain uncompressed file contents in the following cases:
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//
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// * Missing 'Accept-Encoding: gzip' request header.
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// * No write access to directory containing the file.
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//
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// Directory contents is returned if path points to directory.
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//
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// Use ServeFileBytesUncompressed is you don't need serving compressed
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// file contents.
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//
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// See also RequestCtx.SendFileBytes.
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func ServeFileBytes(ctx *RequestCtx, path []byte) {
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ServeFile(ctx, b2s(path))
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}
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// ServeFile returns HTTP response containing compressed file contents
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// from the given path.
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//
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// HTTP response may contain uncompressed file contents in the following cases:
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//
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// * Missing 'Accept-Encoding: gzip' request header.
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// * No write access to directory containing the file.
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//
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// Directory contents is returned if path points to directory.
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//
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// Use ServeFileUncompressed is you don't need serving compressed file contents.
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//
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// See also RequestCtx.SendFile.
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func ServeFile(ctx *RequestCtx, path string) {
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rootFSOnce.Do(func() {
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rootFSHandler = rootFS.NewRequestHandler()
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})
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if len(path) == 0 || path[0] != '/' {
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// extend relative path to absolute path
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var err error
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if path, err = filepath.Abs(path); err != nil {
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ctx.Logger().Printf("cannot resolve path %q to absolute file path: %s", path, err)
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ctx.Error("Internal Server Error", StatusInternalServerError)
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return
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}
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}
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ctx.Request.SetRequestURI(path)
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rootFSHandler(ctx)
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}
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var (
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rootFSOnce sync.Once
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rootFS = &FS{
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Root: "/",
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GenerateIndexPages: true,
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Compress: true,
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AcceptByteRange: true,
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}
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rootFSHandler RequestHandler
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)
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// PathRewriteFunc must return new request path based on arbitrary ctx
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// info such as ctx.Path().
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//
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// Path rewriter is used in FS for translating the current request
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// to the local filesystem path relative to FS.Root.
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//
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// The returned path must not contain '/../' substrings due to security reasons,
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// since such paths may refer files outside FS.Root.
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//
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// The returned path may refer to ctx members. For example, ctx.Path().
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type PathRewriteFunc func(ctx *RequestCtx) []byte
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// NewVHostPathRewriter returns path rewriter, which strips slashesCount
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// leading slashes from the path and prepends the path with request's host,
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// thus simplifying virtual hosting for static files.
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//
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// Examples:
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//
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// * host=foobar.com, slashesCount=0, original path="/foo/bar".
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// Resulting path: "/foobar.com/foo/bar"
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//
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// * host=img.aaa.com, slashesCount=1, original path="/images/123/456.jpg"
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// Resulting path: "/img.aaa.com/123/456.jpg"
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//
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func NewVHostPathRewriter(slashesCount int) PathRewriteFunc {
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return func(ctx *RequestCtx) []byte {
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path := stripLeadingSlashes(ctx.Path(), slashesCount)
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host := ctx.Host()
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if n := bytes.IndexByte(host, '/'); n >= 0 {
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host = nil
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}
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if len(host) == 0 {
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host = strInvalidHost
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}
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b := AcquireByteBuffer()
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b.B = append(b.B, '/')
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b.B = append(b.B, host...)
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b.B = append(b.B, path...)
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ctx.URI().SetPathBytes(b.B)
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ReleaseByteBuffer(b)
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return ctx.Path()
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}
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}
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var strInvalidHost = []byte("invalid-host")
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// NewPathSlashesStripper returns path rewriter, which strips slashesCount
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// leading slashes from the path.
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//
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// Examples:
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//
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// * slashesCount = 0, original path: "/foo/bar", result: "/foo/bar"
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// * slashesCount = 1, original path: "/foo/bar", result: "/bar"
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// * slashesCount = 2, original path: "/foo/bar", result: ""
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//
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// The returned path rewriter may be used as FS.PathRewrite .
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func NewPathSlashesStripper(slashesCount int) PathRewriteFunc {
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return func(ctx *RequestCtx) []byte {
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return stripLeadingSlashes(ctx.Path(), slashesCount)
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}
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}
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// NewPathPrefixStripper returns path rewriter, which removes prefixSize bytes
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// from the path prefix.
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//
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// Examples:
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//
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// * prefixSize = 0, original path: "/foo/bar", result: "/foo/bar"
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// * prefixSize = 3, original path: "/foo/bar", result: "o/bar"
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// * prefixSize = 7, original path: "/foo/bar", result: "r"
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//
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// The returned path rewriter may be used as FS.PathRewrite .
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func NewPathPrefixStripper(prefixSize int) PathRewriteFunc {
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return func(ctx *RequestCtx) []byte {
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path := ctx.Path()
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if len(path) >= prefixSize {
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path = path[prefixSize:]
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}
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return path
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}
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}
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// FS represents settings for request handler serving static files
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// from the local filesystem.
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//
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// It is prohibited copying FS values. Create new values instead.
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type FS struct {
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noCopy noCopy
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// Path to the root directory to serve files from.
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Root string
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// List of index file names to try opening during directory access.
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//
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// For example:
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//
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// * index.html
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// * index.htm
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// * my-super-index.xml
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//
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// By default the list is empty.
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IndexNames []string
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// Index pages for directories without files matching IndexNames
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// are automatically generated if set.
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//
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// Directory index generation may be quite slow for directories
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// with many files (more than 1K), so it is discouraged enabling
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// index pages' generation for such directories.
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//
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// By default index pages aren't generated.
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GenerateIndexPages bool
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// Transparently compresses responses if set to true.
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//
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// The server tries minimizing CPU usage by caching compressed files.
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// It adds CompressedFileSuffix suffix to the original file name and
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// tries saving the resulting compressed file under the new file name.
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// So it is advisable to give the server write access to Root
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// and to all inner folders in order to minimze CPU usage when serving
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// compressed responses.
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//
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// Transparent compression is disabled by default.
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Compress bool
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// Enables byte range requests if set to true.
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//
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// Byte range requests are disabled by default.
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AcceptByteRange bool
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// Path rewriting function.
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//
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// By default request path is not modified.
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PathRewrite PathRewriteFunc
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// Expiration duration for inactive file handlers.
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//
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// FSHandlerCacheDuration is used by default.
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CacheDuration time.Duration
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// Suffix to add to the name of cached compressed file.
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//
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// This value has sense only if Compress is set.
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//
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// FSCompressedFileSuffix is used by default.
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CompressedFileSuffix string
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once sync.Once
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h RequestHandler
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}
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// FSCompressedFileSuffix is the suffix FS adds to the original file names
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// when trying to store compressed file under the new file name.
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// See FS.Compress for details.
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const FSCompressedFileSuffix = ".fasthttp.gz"
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// FSHandlerCacheDuration is the default expiration duration for inactive
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// file handlers opened by FS.
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const FSHandlerCacheDuration = 10 * time.Second
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// FSHandler returns request handler serving static files from
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// the given root folder.
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//
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// stripSlashes indicates how many leading slashes must be stripped
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// from requested path before searching requested file in the root folder.
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// Examples:
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//
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// * stripSlashes = 0, original path: "/foo/bar", result: "/foo/bar"
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// * stripSlashes = 1, original path: "/foo/bar", result: "/bar"
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// * stripSlashes = 2, original path: "/foo/bar", result: ""
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//
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// The returned request handler automatically generates index pages
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// for directories without index.html.
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//
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// The returned handler caches requested file handles
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// for FSHandlerCacheDuration.
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// Make sure your program has enough 'max open files' limit aka
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// 'ulimit -n' if root folder contains many files.
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//
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// Do not create multiple request handler instances for the same
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// (root, stripSlashes) arguments - just reuse a single instance.
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// Otherwise goroutine leak will occur.
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func FSHandler(root string, stripSlashes int) RequestHandler {
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fs := &FS{
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Root: root,
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IndexNames: []string{"index.html"},
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GenerateIndexPages: true,
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AcceptByteRange: true,
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}
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if stripSlashes > 0 {
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fs.PathRewrite = NewPathSlashesStripper(stripSlashes)
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}
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return fs.NewRequestHandler()
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}
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// NewRequestHandler returns new request handler with the given FS settings.
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//
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// The returned handler caches requested file handles
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// for FS.CacheDuration.
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// Make sure your program has enough 'max open files' limit aka
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// 'ulimit -n' if FS.Root folder contains many files.
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//
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// Do not create multiple request handlers from a single FS instance -
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// just reuse a single request handler.
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func (fs *FS) NewRequestHandler() RequestHandler {
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fs.once.Do(fs.initRequestHandler)
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return fs.h
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}
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func (fs *FS) initRequestHandler() {
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root := fs.Root
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// serve files from the current working directory if root is empty
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if len(root) == 0 {
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root = "."
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}
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// strip trailing slashes from the root path
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for len(root) > 0 && root[len(root)-1] == '/' {
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root = root[:len(root)-1]
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}
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cacheDuration := fs.CacheDuration
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if cacheDuration <= 0 {
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cacheDuration = FSHandlerCacheDuration
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}
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compressedFileSuffix := fs.CompressedFileSuffix
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if len(compressedFileSuffix) == 0 {
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compressedFileSuffix = FSCompressedFileSuffix
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}
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h := &fsHandler{
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root: root,
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indexNames: fs.IndexNames,
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pathRewrite: fs.PathRewrite,
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generateIndexPages: fs.GenerateIndexPages,
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compress: fs.Compress,
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acceptByteRange: fs.AcceptByteRange,
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cacheDuration: cacheDuration,
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compressedFileSuffix: compressedFileSuffix,
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cache: make(map[string]*fsFile),
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compressedCache: make(map[string]*fsFile),
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}
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go func() {
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var pendingFiles []*fsFile
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for {
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time.Sleep(cacheDuration / 2)
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pendingFiles = h.cleanCache(pendingFiles)
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}
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}()
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fs.h = h.handleRequest
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}
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type fsHandler struct {
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root string
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indexNames []string
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pathRewrite PathRewriteFunc
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generateIndexPages bool
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compress bool
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acceptByteRange bool
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cacheDuration time.Duration
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compressedFileSuffix string
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cache map[string]*fsFile
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compressedCache map[string]*fsFile
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cacheLock sync.Mutex
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smallFileReaderPool sync.Pool
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}
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type fsFile struct {
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h *fsHandler
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f *os.File
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dirIndex []byte
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contentType string
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contentLength int
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compressed bool
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lastModified time.Time
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lastModifiedStr []byte
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t time.Time
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readersCount int
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bigFiles []*bigFileReader
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bigFilesLock sync.Mutex
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}
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func (ff *fsFile) NewReader() (io.Reader, error) {
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if ff.isBig() {
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r, err := ff.bigFileReader()
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if err != nil {
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ff.decReadersCount()
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}
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return r, err
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}
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return ff.smallFileReader(), nil
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}
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func (ff *fsFile) smallFileReader() io.Reader {
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v := ff.h.smallFileReaderPool.Get()
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if v == nil {
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v = &fsSmallFileReader{}
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}
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r := v.(*fsSmallFileReader)
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r.ff = ff
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r.endPos = ff.contentLength
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if r.startPos > 0 {
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panic("BUG: fsSmallFileReader with non-nil startPos found in the pool")
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}
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return r
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}
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// files bigger than this size are sent with sendfile
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const maxSmallFileSize = 2 * 4096
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func (ff *fsFile) isBig() bool {
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return ff.contentLength > maxSmallFileSize && len(ff.dirIndex) == 0
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}
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||||
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func (ff *fsFile) bigFileReader() (io.Reader, error) {
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if ff.f == nil {
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panic("BUG: ff.f must be non-nil in bigFileReader")
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}
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||||
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var r io.Reader
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ff.bigFilesLock.Lock()
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n := len(ff.bigFiles)
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if n > 0 {
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r = ff.bigFiles[n-1]
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ff.bigFiles = ff.bigFiles[:n-1]
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}
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ff.bigFilesLock.Unlock()
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||||
|
||||
if r != nil {
|
||||
return r, nil
|
||||
}
|
||||
|
||||
f, err := os.Open(ff.f.Name())
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("cannot open already opened file: %s", err)
|
||||
}
|
||||
return &bigFileReader{
|
||||
f: f,
|
||||
ff: ff,
|
||||
r: f,
|
||||
}, nil
|
||||
}
|
||||
|
||||
func (ff *fsFile) Release() {
|
||||
if ff.f != nil {
|
||||
ff.f.Close()
|
||||
|
||||
if ff.isBig() {
|
||||
ff.bigFilesLock.Lock()
|
||||
for _, r := range ff.bigFiles {
|
||||
r.f.Close()
|
||||
}
|
||||
ff.bigFilesLock.Unlock()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (ff *fsFile) decReadersCount() {
|
||||
ff.h.cacheLock.Lock()
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||||
ff.readersCount--
|
||||
if ff.readersCount < 0 {
|
||||
panic("BUG: negative fsFile.readersCount!")
|
||||
}
|
||||
ff.h.cacheLock.Unlock()
|
||||
}
|
||||
|
||||
// bigFileReader attempts to trigger sendfile
|
||||
// for sending big files over the wire.
|
||||
type bigFileReader struct {
|
||||
f *os.File
|
||||
ff *fsFile
|
||||
r io.Reader
|
||||
lr io.LimitedReader
|
||||
}
|
||||
|
||||
func (r *bigFileReader) UpdateByteRange(startPos, endPos int) error {
|
||||
if _, err := r.f.Seek(int64(startPos), 0); err != nil {
|
||||
return err
|
||||
}
|
||||
r.r = &r.lr
|
||||
r.lr.R = r.f
|
||||
r.lr.N = int64(endPos - startPos + 1)
|
||||
return nil
|
||||
}
|
||||
|
||||
func (r *bigFileReader) Read(p []byte) (int, error) {
|
||||
return r.r.Read(p)
|
||||
}
|
||||
|
||||
func (r *bigFileReader) WriteTo(w io.Writer) (int64, error) {
|
||||
if rf, ok := w.(io.ReaderFrom); ok {
|
||||
// fast path. Senfile must be triggered
|
||||
return rf.ReadFrom(r.r)
|
||||
}
|
||||
|
||||
// slow path
|
||||
return copyZeroAlloc(w, r.r)
|
||||
}
|
||||
|
||||
func (r *bigFileReader) Close() error {
|
||||
r.r = r.f
|
||||
n, err := r.f.Seek(0, 0)
|
||||
if err == nil {
|
||||
if n != 0 {
|
||||
panic("BUG: File.Seek(0,0) returned (non-zero, nil)")
|
||||
}
|
||||
|
||||
ff := r.ff
|
||||
ff.bigFilesLock.Lock()
|
||||
ff.bigFiles = append(ff.bigFiles, r)
|
||||
ff.bigFilesLock.Unlock()
|
||||
} else {
|
||||
r.f.Close()
|
||||
}
|
||||
r.ff.decReadersCount()
|
||||
return err
|
||||
}
|
||||
|
||||
type fsSmallFileReader struct {
|
||||
ff *fsFile
|
||||
startPos int
|
||||
endPos int
|
||||
}
|
||||
|
||||
func (r *fsSmallFileReader) Close() error {
|
||||
ff := r.ff
|
||||
ff.decReadersCount()
|
||||
r.ff = nil
|
||||
r.startPos = 0
|
||||
r.endPos = 0
|
||||
ff.h.smallFileReaderPool.Put(r)
|
||||
return nil
|
||||
}
|
||||
|
||||
func (r *fsSmallFileReader) UpdateByteRange(startPos, endPos int) error {
|
||||
r.startPos = startPos
|
||||
r.endPos = endPos + 1
|
||||
return nil
|
||||
}
|
||||
|
||||
func (r *fsSmallFileReader) Read(p []byte) (int, error) {
|
||||
tailLen := r.endPos - r.startPos
|
||||
if tailLen <= 0 {
|
||||
return 0, io.EOF
|
||||
}
|
||||
if len(p) > tailLen {
|
||||
p = p[:tailLen]
|
||||
}
|
||||
|
||||
ff := r.ff
|
||||
if ff.f != nil {
|
||||
n, err := ff.f.ReadAt(p, int64(r.startPos))
|
||||
r.startPos += n
|
||||
return n, err
|
||||
}
|
||||
|
||||
n := copy(p, ff.dirIndex[r.startPos:])
|
||||
r.startPos += n
|
||||
return n, nil
|
||||
}
|
||||
|
||||
func (r *fsSmallFileReader) WriteTo(w io.Writer) (int64, error) {
|
||||
ff := r.ff
|
||||
|
||||
var n int
|
||||
var err error
|
||||
if ff.f == nil {
|
||||
n, err = w.Write(ff.dirIndex[r.startPos:r.endPos])
|
||||
return int64(n), err
|
||||
}
|
||||
|
||||
if rf, ok := w.(io.ReaderFrom); ok {
|
||||
return rf.ReadFrom(r)
|
||||
}
|
||||
|
||||
curPos := r.startPos
|
||||
bufv := copyBufPool.Get()
|
||||
buf := bufv.([]byte)
|
||||
for err == nil {
|
||||
tailLen := r.endPos - curPos
|
||||
if tailLen <= 0 {
|
||||
break
|
||||
}
|
||||
if len(buf) > tailLen {
|
||||
buf = buf[:tailLen]
|
||||
}
|
||||
n, err = ff.f.ReadAt(buf, int64(curPos))
|
||||
nw, errw := w.Write(buf[:n])
|
||||
curPos += nw
|
||||
if errw == nil && nw != n {
|
||||
panic("BUG: Write(p) returned (n, nil), where n != len(p)")
|
||||
}
|
||||
if err == nil {
|
||||
err = errw
|
||||
}
|
||||
}
|
||||
copyBufPool.Put(bufv)
|
||||
|
||||
if err == io.EOF {
|
||||
err = nil
|
||||
}
|
||||
return int64(curPos - r.startPos), err
|
||||
}
|
||||
|
||||
func (h *fsHandler) cleanCache(pendingFiles []*fsFile) []*fsFile {
|
||||
var filesToRelease []*fsFile
|
||||
|
||||
h.cacheLock.Lock()
|
||||
|
||||
// Close files which couldn't be closed before due to non-zero
|
||||
// readers count on the previous run.
|
||||
var remainingFiles []*fsFile
|
||||
for _, ff := range pendingFiles {
|
||||
if ff.readersCount > 0 {
|
||||
remainingFiles = append(remainingFiles, ff)
|
||||
} else {
|
||||
filesToRelease = append(filesToRelease, ff)
|
||||
}
|
||||
}
|
||||
pendingFiles = remainingFiles
|
||||
|
||||
pendingFiles, filesToRelease = cleanCacheNolock(h.cache, pendingFiles, filesToRelease, h.cacheDuration)
|
||||
pendingFiles, filesToRelease = cleanCacheNolock(h.compressedCache, pendingFiles, filesToRelease, h.cacheDuration)
|
||||
|
||||
h.cacheLock.Unlock()
|
||||
|
||||
for _, ff := range filesToRelease {
|
||||
ff.Release()
|
||||
}
|
||||
|
||||
return pendingFiles
|
||||
}
|
||||
|
||||
func cleanCacheNolock(cache map[string]*fsFile, pendingFiles, filesToRelease []*fsFile, cacheDuration time.Duration) ([]*fsFile, []*fsFile) {
|
||||
t := time.Now()
|
||||
for k, ff := range cache {
|
||||
if t.Sub(ff.t) > cacheDuration {
|
||||
if ff.readersCount > 0 {
|
||||
// There are pending readers on stale file handle,
|
||||
// so we cannot close it. Put it into pendingFiles
|
||||
// so it will be closed later.
|
||||
pendingFiles = append(pendingFiles, ff)
|
||||
} else {
|
||||
filesToRelease = append(filesToRelease, ff)
|
||||
}
|
||||
delete(cache, k)
|
||||
}
|
||||
}
|
||||
return pendingFiles, filesToRelease
|
||||
}
|
||||
|
||||
func (h *fsHandler) handleRequest(ctx *RequestCtx) {
|
||||
var path []byte
|
||||
if h.pathRewrite != nil {
|
||||
path = h.pathRewrite(ctx)
|
||||
} else {
|
||||
path = ctx.Path()
|
||||
}
|
||||
path = stripTrailingSlashes(path)
|
||||
|
||||
if n := bytes.IndexByte(path, 0); n >= 0 {
|
||||
ctx.Logger().Printf("cannot serve path with nil byte at position %d: %q", n, path)
|
||||
ctx.Error("Are you a hacker?", StatusBadRequest)
|
||||
return
|
||||
}
|
||||
if h.pathRewrite != nil {
|
||||
// There is no need to check for '/../' if path = ctx.Path(),
|
||||
// since ctx.Path must normalize and sanitize the path.
|
||||
|
||||
if n := bytes.Index(path, strSlashDotDotSlash); n >= 0 {
|
||||
ctx.Logger().Printf("cannot serve path with '/../' at position %d due to security reasons: %q", n, path)
|
||||
ctx.Error("Internal Server Error", StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
mustCompress := false
|
||||
fileCache := h.cache
|
||||
byteRange := ctx.Request.Header.peek(strRange)
|
||||
if len(byteRange) == 0 && h.compress && ctx.Request.Header.HasAcceptEncodingBytes(strGzip) {
|
||||
mustCompress = true
|
||||
fileCache = h.compressedCache
|
||||
}
|
||||
|
||||
h.cacheLock.Lock()
|
||||
ff, ok := fileCache[string(path)]
|
||||
if ok {
|
||||
ff.readersCount++
|
||||
}
|
||||
h.cacheLock.Unlock()
|
||||
|
||||
if !ok {
|
||||
pathStr := string(path)
|
||||
filePath := h.root + pathStr
|
||||
var err error
|
||||
ff, err = h.openFSFile(filePath, mustCompress)
|
||||
if mustCompress && err == errNoCreatePermission {
|
||||
ctx.Logger().Printf("insufficient permissions for saving compressed file for %q. Serving uncompressed file. "+
|
||||
"Allow write access to the directory with this file in order to improve fasthttp performance", filePath)
|
||||
mustCompress = false
|
||||
ff, err = h.openFSFile(filePath, mustCompress)
|
||||
}
|
||||
if err == errDirIndexRequired {
|
||||
ff, err = h.openIndexFile(ctx, filePath, mustCompress)
|
||||
if err != nil {
|
||||
ctx.Logger().Printf("cannot open dir index %q: %s", filePath, err)
|
||||
ctx.Error("Directory index is forbidden", StatusForbidden)
|
||||
return
|
||||
}
|
||||
} else if err != nil {
|
||||
ctx.Logger().Printf("cannot open file %q: %s", filePath, err)
|
||||
ctx.Error("Cannot open requested path", StatusNotFound)
|
||||
return
|
||||
}
|
||||
|
||||
h.cacheLock.Lock()
|
||||
ff1, ok := fileCache[pathStr]
|
||||
if !ok {
|
||||
fileCache[pathStr] = ff
|
||||
ff.readersCount++
|
||||
} else {
|
||||
ff1.readersCount++
|
||||
}
|
||||
h.cacheLock.Unlock()
|
||||
|
||||
if ok {
|
||||
// The file has been already opened by another
|
||||
// goroutine, so close the current file and use
|
||||
// the file opened by another goroutine instead.
|
||||
ff.Release()
|
||||
ff = ff1
|
||||
}
|
||||
}
|
||||
|
||||
if !ctx.IfModifiedSince(ff.lastModified) {
|
||||
ff.decReadersCount()
|
||||
ctx.NotModified()
|
||||
return
|
||||
}
|
||||
|
||||
r, err := ff.NewReader()
|
||||
if err != nil {
|
||||
ctx.Logger().Printf("cannot obtain file reader for path=%q: %s", path, err)
|
||||
ctx.Error("Internal Server Error", StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
hdr := &ctx.Response.Header
|
||||
if ff.compressed {
|
||||
hdr.SetCanonical(strContentEncoding, strGzip)
|
||||
}
|
||||
|
||||
statusCode := StatusOK
|
||||
contentLength := ff.contentLength
|
||||
if h.acceptByteRange {
|
||||
hdr.SetCanonical(strAcceptRanges, strBytes)
|
||||
if len(byteRange) > 0 {
|
||||
startPos, endPos, err := ParseByteRange(byteRange, contentLength)
|
||||
if err != nil {
|
||||
r.(io.Closer).Close()
|
||||
ctx.Logger().Printf("cannot parse byte range %q for path=%q: %s", byteRange, path, err)
|
||||
ctx.Error("Range Not Satisfiable", StatusRequestedRangeNotSatisfiable)
|
||||
return
|
||||
}
|
||||
|
||||
if err = r.(byteRangeUpdater).UpdateByteRange(startPos, endPos); err != nil {
|
||||
r.(io.Closer).Close()
|
||||
ctx.Logger().Printf("cannot seek byte range %q for path=%q: %s", byteRange, path, err)
|
||||
ctx.Error("Internal Server Error", StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
hdr.SetContentRange(startPos, endPos, contentLength)
|
||||
contentLength = endPos - startPos + 1
|
||||
statusCode = StatusPartialContent
|
||||
}
|
||||
}
|
||||
|
||||
hdr.SetCanonical(strLastModified, ff.lastModifiedStr)
|
||||
if !ctx.IsHead() {
|
||||
ctx.SetBodyStream(r, contentLength)
|
||||
} else {
|
||||
ctx.Response.ResetBody()
|
||||
ctx.Response.SkipBody = true
|
||||
ctx.Response.Header.SetContentLength(contentLength)
|
||||
if rc, ok := r.(io.Closer); ok {
|
||||
if err := rc.Close(); err != nil {
|
||||
ctx.Logger().Printf("cannot close file reader: %s", err)
|
||||
ctx.Error("Internal Server Error", StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
ctx.SetContentType(ff.contentType)
|
||||
ctx.SetStatusCode(statusCode)
|
||||
}
|
||||
|
||||
type byteRangeUpdater interface {
|
||||
UpdateByteRange(startPos, endPos int) error
|
||||
}
|
||||
|
||||
// ParseByteRange parses 'Range: bytes=...' header value.
|
||||
//
|
||||
// It follows https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35 .
|
||||
func ParseByteRange(byteRange []byte, contentLength int) (startPos, endPos int, err error) {
|
||||
b := byteRange
|
||||
if !bytes.HasPrefix(b, strBytes) {
|
||||
return 0, 0, fmt.Errorf("unsupported range units: %q. Expecting %q", byteRange, strBytes)
|
||||
}
|
||||
|
||||
b = b[len(strBytes):]
|
||||
if len(b) == 0 || b[0] != '=' {
|
||||
return 0, 0, fmt.Errorf("missing byte range in %q", byteRange)
|
||||
}
|
||||
b = b[1:]
|
||||
|
||||
n := bytes.IndexByte(b, '-')
|
||||
if n < 0 {
|
||||
return 0, 0, fmt.Errorf("missing the end position of byte range in %q", byteRange)
|
||||
}
|
||||
|
||||
if n == 0 {
|
||||
v, err := ParseUint(b[n+1:])
|
||||
if err != nil {
|
||||
return 0, 0, err
|
||||
}
|
||||
startPos := contentLength - v
|
||||
if startPos < 0 {
|
||||
startPos = 0
|
||||
}
|
||||
return startPos, contentLength - 1, nil
|
||||
}
|
||||
|
||||
if startPos, err = ParseUint(b[:n]); err != nil {
|
||||
return 0, 0, err
|
||||
}
|
||||
if startPos >= contentLength {
|
||||
return 0, 0, fmt.Errorf("the start position of byte range cannot exceed %d. byte range %q", contentLength-1, byteRange)
|
||||
}
|
||||
|
||||
b = b[n+1:]
|
||||
if len(b) == 0 {
|
||||
return startPos, contentLength - 1, nil
|
||||
}
|
||||
|
||||
if endPos, err = ParseUint(b); err != nil {
|
||||
return 0, 0, err
|
||||
}
|
||||
if endPos >= contentLength {
|
||||
endPos = contentLength - 1
|
||||
}
|
||||
if endPos < startPos {
|
||||
return 0, 0, fmt.Errorf("the start position of byte range cannot exceed the end position. byte range %q", byteRange)
|
||||
}
|
||||
return startPos, endPos, nil
|
||||
}
|
||||
|
||||
func (h *fsHandler) openIndexFile(ctx *RequestCtx, dirPath string, mustCompress bool) (*fsFile, error) {
|
||||
for _, indexName := range h.indexNames {
|
||||
indexFilePath := dirPath + "/" + indexName
|
||||
ff, err := h.openFSFile(indexFilePath, mustCompress)
|
||||
if err == nil {
|
||||
return ff, nil
|
||||
}
|
||||
if !os.IsNotExist(err) {
|
||||
return nil, fmt.Errorf("cannot open file %q: %s", indexFilePath, err)
|
||||
}
|
||||
}
|
||||
|
||||
if !h.generateIndexPages {
|
||||
return nil, fmt.Errorf("cannot access directory without index page. Directory %q", dirPath)
|
||||
}
|
||||
|
||||
return h.createDirIndex(ctx.URI(), dirPath, mustCompress)
|
||||
}
|
||||
|
||||
var (
|
||||
errDirIndexRequired = errors.New("directory index required")
|
||||
errNoCreatePermission = errors.New("no 'create file' permissions")
|
||||
)
|
||||
|
||||
func (h *fsHandler) createDirIndex(base *URI, dirPath string, mustCompress bool) (*fsFile, error) {
|
||||
w := &ByteBuffer{}
|
||||
|
||||
basePathEscaped := html.EscapeString(string(base.Path()))
|
||||
fmt.Fprintf(w, "<html><head><title>%s</title><style>.dir { font-weight: bold }</style></head><body>", basePathEscaped)
|
||||
fmt.Fprintf(w, "<h1>%s</h1>", basePathEscaped)
|
||||
fmt.Fprintf(w, "<ul>")
|
||||
|
||||
if len(basePathEscaped) > 1 {
|
||||
var parentURI URI
|
||||
base.CopyTo(&parentURI)
|
||||
parentURI.Update(string(base.Path()) + "/..")
|
||||
parentPathEscaped := html.EscapeString(string(parentURI.Path()))
|
||||
fmt.Fprintf(w, `<li><a href="%s" class="dir">..</a></li>`, parentPathEscaped)
|
||||
}
|
||||
|
||||
f, err := os.Open(dirPath)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
fileinfos, err := f.Readdir(0)
|
||||
f.Close()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
fm := make(map[string]os.FileInfo, len(fileinfos))
|
||||
var filenames []string
|
||||
for _, fi := range fileinfos {
|
||||
name := fi.Name()
|
||||
if strings.HasSuffix(name, h.compressedFileSuffix) {
|
||||
// Do not show compressed files on index page.
|
||||
continue
|
||||
}
|
||||
fm[name] = fi
|
||||
filenames = append(filenames, name)
|
||||
}
|
||||
|
||||
var u URI
|
||||
base.CopyTo(&u)
|
||||
u.Update(string(u.Path()) + "/")
|
||||
|
||||
sort.Sort(sort.StringSlice(filenames))
|
||||
for _, name := range filenames {
|
||||
u.Update(name)
|
||||
pathEscaped := html.EscapeString(string(u.Path()))
|
||||
fi := fm[name]
|
||||
auxStr := "dir"
|
||||
className := "dir"
|
||||
if !fi.IsDir() {
|
||||
auxStr = fmt.Sprintf("file, %d bytes", fi.Size())
|
||||
className = "file"
|
||||
}
|
||||
fmt.Fprintf(w, `<li><a href="%s" class="%s">%s</a>, %s, last modified %s</li>`,
|
||||
pathEscaped, className, html.EscapeString(name), auxStr, fsModTime(fi.ModTime()))
|
||||
}
|
||||
|
||||
fmt.Fprintf(w, "</ul></body></html>")
|
||||
|
||||
if mustCompress {
|
||||
var zbuf ByteBuffer
|
||||
zbuf.B = AppendGzipBytesLevel(zbuf.B, w.B, CompressDefaultCompression)
|
||||
w = &zbuf
|
||||
}
|
||||
|
||||
dirIndex := w.B
|
||||
lastModified := time.Now()
|
||||
ff := &fsFile{
|
||||
h: h,
|
||||
dirIndex: dirIndex,
|
||||
contentType: "text/html; charset=utf-8",
|
||||
contentLength: len(dirIndex),
|
||||
compressed: mustCompress,
|
||||
lastModified: lastModified,
|
||||
lastModifiedStr: AppendHTTPDate(nil, lastModified),
|
||||
|
||||
t: lastModified,
|
||||
}
|
||||
return ff, nil
|
||||
}
|
||||
|
||||
const (
|
||||
fsMinCompressRatio = 0.8
|
||||
fsMaxCompressibleFileSize = 8 * 1024 * 1024
|
||||
)
|
||||
|
||||
func (h *fsHandler) compressAndOpenFSFile(filePath string) (*fsFile, error) {
|
||||
f, err := os.Open(filePath)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
fileInfo, err := f.Stat()
|
||||
if err != nil {
|
||||
f.Close()
|
||||
return nil, fmt.Errorf("cannot obtain info for file %q: %s", filePath, err)
|
||||
}
|
||||
|
||||
if fileInfo.IsDir() {
|
||||
f.Close()
|
||||
return nil, errDirIndexRequired
|
||||
}
|
||||
|
||||
if strings.HasSuffix(filePath, h.compressedFileSuffix) ||
|
||||
fileInfo.Size() > fsMaxCompressibleFileSize ||
|
||||
!isFileCompressible(f, fsMinCompressRatio) {
|
||||
return h.newFSFile(f, fileInfo, false)
|
||||
}
|
||||
|
||||
compressedFilePath := filePath + h.compressedFileSuffix
|
||||
absPath, err := filepath.Abs(compressedFilePath)
|
||||
if err != nil {
|
||||
f.Close()
|
||||
return nil, fmt.Errorf("cannot determine absolute path for %q: %s", compressedFilePath, err)
|
||||
}
|
||||
|
||||
flock := getFileLock(absPath)
|
||||
flock.Lock()
|
||||
ff, err := h.compressFileNolock(f, fileInfo, filePath, compressedFilePath)
|
||||
flock.Unlock()
|
||||
|
||||
return ff, err
|
||||
}
|
||||
|
||||
func (h *fsHandler) compressFileNolock(f *os.File, fileInfo os.FileInfo, filePath, compressedFilePath string) (*fsFile, error) {
|
||||
// Attempt to open compressed file created by another concurrent
|
||||
// goroutine.
|
||||
// It is safe opening such a file, since the file creation
|
||||
// is guarded by file mutex - see getFileLock call.
|
||||
if _, err := os.Stat(compressedFilePath); err == nil {
|
||||
f.Close()
|
||||
return h.newCompressedFSFile(compressedFilePath)
|
||||
}
|
||||
|
||||
// Create temporary file, so concurrent goroutines don't use
|
||||
// it until it is created.
|
||||
tmpFilePath := compressedFilePath + ".tmp"
|
||||
zf, err := os.Create(tmpFilePath)
|
||||
if err != nil {
|
||||
f.Close()
|
||||
if !os.IsPermission(err) {
|
||||
return nil, fmt.Errorf("cannot create temporary file %q: %s", tmpFilePath, err)
|
||||
}
|
||||
return nil, errNoCreatePermission
|
||||
}
|
||||
|
||||
zw := acquireStacklessGzipWriter(zf, CompressDefaultCompression)
|
||||
_, err = copyZeroAlloc(zw, f)
|
||||
if err1 := zw.Flush(); err == nil {
|
||||
err = err1
|
||||
}
|
||||
releaseStacklessGzipWriter(zw, CompressDefaultCompression)
|
||||
zf.Close()
|
||||
f.Close()
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("error when compressing file %q to %q: %s", filePath, tmpFilePath, err)
|
||||
}
|
||||
if err = os.Chtimes(tmpFilePath, time.Now(), fileInfo.ModTime()); err != nil {
|
||||
return nil, fmt.Errorf("cannot change modification time to %s for tmp file %q: %s",
|
||||
fileInfo.ModTime(), tmpFilePath, err)
|
||||
}
|
||||
if err = os.Rename(tmpFilePath, compressedFilePath); err != nil {
|
||||
return nil, fmt.Errorf("cannot move compressed file from %q to %q: %s", tmpFilePath, compressedFilePath, err)
|
||||
}
|
||||
return h.newCompressedFSFile(compressedFilePath)
|
||||
}
|
||||
|
||||
func (h *fsHandler) newCompressedFSFile(filePath string) (*fsFile, error) {
|
||||
f, err := os.Open(filePath)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("cannot open compressed file %q: %s", filePath, err)
|
||||
}
|
||||
fileInfo, err := f.Stat()
|
||||
if err != nil {
|
||||
f.Close()
|
||||
return nil, fmt.Errorf("cannot obtain info for compressed file %q: %s", filePath, err)
|
||||
}
|
||||
return h.newFSFile(f, fileInfo, true)
|
||||
}
|
||||
|
||||
func (h *fsHandler) openFSFile(filePath string, mustCompress bool) (*fsFile, error) {
|
||||
filePathOriginal := filePath
|
||||
if mustCompress {
|
||||
filePath += h.compressedFileSuffix
|
||||
}
|
||||
|
||||
f, err := os.Open(filePath)
|
||||
if err != nil {
|
||||
if mustCompress && os.IsNotExist(err) {
|
||||
return h.compressAndOpenFSFile(filePathOriginal)
|
||||
}
|
||||
return nil, err
|
||||
}
|
||||
|
||||
fileInfo, err := f.Stat()
|
||||
if err != nil {
|
||||
f.Close()
|
||||
return nil, fmt.Errorf("cannot obtain info for file %q: %s", filePath, err)
|
||||
}
|
||||
|
||||
if fileInfo.IsDir() {
|
||||
f.Close()
|
||||
if mustCompress {
|
||||
return nil, fmt.Errorf("directory with unexpected suffix found: %q. Suffix: %q",
|
||||
filePath, h.compressedFileSuffix)
|
||||
}
|
||||
return nil, errDirIndexRequired
|
||||
}
|
||||
|
||||
if mustCompress {
|
||||
fileInfoOriginal, err := os.Stat(filePathOriginal)
|
||||
if err != nil {
|
||||
f.Close()
|
||||
return nil, fmt.Errorf("cannot obtain info for original file %q: %s", filePathOriginal, err)
|
||||
}
|
||||
|
||||
if fileInfoOriginal.ModTime() != fileInfo.ModTime() {
|
||||
// The compressed file became stale. Re-create it.
|
||||
f.Close()
|
||||
os.Remove(filePath)
|
||||
return h.compressAndOpenFSFile(filePathOriginal)
|
||||
}
|
||||
}
|
||||
|
||||
return h.newFSFile(f, fileInfo, mustCompress)
|
||||
}
|
||||
|
||||
func (h *fsHandler) newFSFile(f *os.File, fileInfo os.FileInfo, compressed bool) (*fsFile, error) {
|
||||
n := fileInfo.Size()
|
||||
contentLength := int(n)
|
||||
if n != int64(contentLength) {
|
||||
f.Close()
|
||||
return nil, fmt.Errorf("too big file: %d bytes", n)
|
||||
}
|
||||
|
||||
// detect content-type
|
||||
ext := fileExtension(fileInfo.Name(), compressed, h.compressedFileSuffix)
|
||||
contentType := mime.TypeByExtension(ext)
|
||||
if len(contentType) == 0 {
|
||||
data, err := readFileHeader(f, compressed)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("cannot read header of the file %q: %s", f.Name(), err)
|
||||
}
|
||||
contentType = http.DetectContentType(data)
|
||||
}
|
||||
|
||||
lastModified := fileInfo.ModTime()
|
||||
ff := &fsFile{
|
||||
h: h,
|
||||
f: f,
|
||||
contentType: contentType,
|
||||
contentLength: contentLength,
|
||||
compressed: compressed,
|
||||
lastModified: lastModified,
|
||||
lastModifiedStr: AppendHTTPDate(nil, lastModified),
|
||||
|
||||
t: time.Now(),
|
||||
}
|
||||
return ff, nil
|
||||
}
|
||||
|
||||
func readFileHeader(f *os.File, compressed bool) ([]byte, error) {
|
||||
r := io.Reader(f)
|
||||
var zr *gzip.Reader
|
||||
if compressed {
|
||||
var err error
|
||||
if zr, err = acquireGzipReader(f); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
r = zr
|
||||
}
|
||||
|
||||
lr := &io.LimitedReader{
|
||||
R: r,
|
||||
N: 512,
|
||||
}
|
||||
data, err := ioutil.ReadAll(lr)
|
||||
f.Seek(0, 0)
|
||||
|
||||
if zr != nil {
|
||||
releaseGzipReader(zr)
|
||||
}
|
||||
|
||||
return data, err
|
||||
}
|
||||
|
||||
func stripLeadingSlashes(path []byte, stripSlashes int) []byte {
|
||||
for stripSlashes > 0 && len(path) > 0 {
|
||||
if path[0] != '/' {
|
||||
panic("BUG: path must start with slash")
|
||||
}
|
||||
n := bytes.IndexByte(path[1:], '/')
|
||||
if n < 0 {
|
||||
path = path[:0]
|
||||
break
|
||||
}
|
||||
path = path[n+1:]
|
||||
stripSlashes--
|
||||
}
|
||||
return path
|
||||
}
|
||||
|
||||
func stripTrailingSlashes(path []byte) []byte {
|
||||
for len(path) > 0 && path[len(path)-1] == '/' {
|
||||
path = path[:len(path)-1]
|
||||
}
|
||||
return path
|
||||
}
|
||||
|
||||
func fileExtension(path string, compressed bool, compressedFileSuffix string) string {
|
||||
if compressed && strings.HasSuffix(path, compressedFileSuffix) {
|
||||
path = path[:len(path)-len(compressedFileSuffix)]
|
||||
}
|
||||
n := strings.LastIndexByte(path, '.')
|
||||
if n < 0 {
|
||||
return ""
|
||||
}
|
||||
return path[n:]
|
||||
}
|
||||
|
||||
// FileLastModified returns last modified time for the file.
|
||||
func FileLastModified(path string) (time.Time, error) {
|
||||
f, err := os.Open(path)
|
||||
if err != nil {
|
||||
return zeroTime, err
|
||||
}
|
||||
fileInfo, err := f.Stat()
|
||||
f.Close()
|
||||
if err != nil {
|
||||
return zeroTime, err
|
||||
}
|
||||
return fsModTime(fileInfo.ModTime()), nil
|
||||
}
|
||||
|
||||
func fsModTime(t time.Time) time.Time {
|
||||
return t.In(time.UTC).Truncate(time.Second)
|
||||
}
|
||||
|
||||
var (
|
||||
filesLockMap = make(map[string]*sync.Mutex)
|
||||
filesLockMapLock sync.Mutex
|
||||
)
|
||||
|
||||
func getFileLock(absPath string) *sync.Mutex {
|
||||
filesLockMapLock.Lock()
|
||||
flock := filesLockMap[absPath]
|
||||
if flock == nil {
|
||||
flock = &sync.Mutex{}
|
||||
filesLockMap[absPath] = flock
|
||||
}
|
||||
filesLockMapLock.Unlock()
|
||||
return flock
|
||||
}
|
||||
Reference in New Issue
Block a user