mirror of
https://github.com/ipfs/kubo.git
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440 lines
12 KiB
Go
440 lines
12 KiB
Go
package corehttp
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import (
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"errors"
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"fmt"
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"io"
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"net/http"
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gopath "path"
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"strings"
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"time"
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"github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
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key "github.com/ipfs/go-ipfs/blocks/key"
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core "github.com/ipfs/go-ipfs/core"
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"github.com/ipfs/go-ipfs/importer"
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chunk "github.com/ipfs/go-ipfs/importer/chunk"
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dag "github.com/ipfs/go-ipfs/merkledag"
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path "github.com/ipfs/go-ipfs/path"
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"github.com/ipfs/go-ipfs/routing"
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uio "github.com/ipfs/go-ipfs/unixfs/io"
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)
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const (
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ipfsPathPrefix = "/ipfs/"
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ipnsPathPrefix = "/ipns/"
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)
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// gatewayHandler is a HTTP handler that serves IPFS objects (accessible by default at /ipfs/<path>)
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// (it serves requests like GET /ipfs/QmVRzPKPzNtSrEzBFm2UZfxmPAgnaLke4DMcerbsGGSaFe/link)
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type gatewayHandler struct {
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node *core.IpfsNode
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config GatewayConfig
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}
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func newGatewayHandler(node *core.IpfsNode, conf GatewayConfig) (*gatewayHandler, error) {
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i := &gatewayHandler{
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node: node,
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config: conf,
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}
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return i, nil
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}
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// TODO(cryptix): find these helpers somewhere else
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func (i *gatewayHandler) newDagFromReader(r io.Reader) (*dag.Node, error) {
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// TODO(cryptix): change and remove this helper once PR1136 is merged
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// return ufs.AddFromReader(i.node, r.Body)
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return importer.BuildDagFromReader(
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r, i.node.DAG, chunk.DefaultSplitter, importer.BasicPinnerCB(i.node.Pinning.GetManual()))
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}
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// TODO(btc): break this apart into separate handlers using a more expressive muxer
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func (i *gatewayHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if i.config.Writable {
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switch r.Method {
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case "POST":
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i.postHandler(w, r)
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return
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case "PUT":
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i.putHandler(w, r)
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return
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case "DELETE":
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i.deleteHandler(w, r)
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return
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}
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}
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if r.Method == "GET" || r.Method == "HEAD" {
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i.getOrHeadHandler(w, r)
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return
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}
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errmsg := "Method " + r.Method + " not allowed: "
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if !i.config.Writable {
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w.WriteHeader(http.StatusMethodNotAllowed)
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errmsg = errmsg + "read only access"
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} else {
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w.WriteHeader(http.StatusBadRequest)
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errmsg = errmsg + "bad request for " + r.URL.Path
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}
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fmt.Fprint(w, errmsg)
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log.Error(errmsg) // TODO(cryptix): log errors until we have a better way to expose these (counter metrics maybe)
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}
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func (i *gatewayHandler) getOrHeadHandler(w http.ResponseWriter, r *http.Request) {
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ctx, cancel := context.WithCancel(i.node.Context())
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defer cancel()
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urlPath := r.URL.Path
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if i.config.BlockList != nil && i.config.BlockList.ShouldBlock(urlPath) {
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w.WriteHeader(http.StatusForbidden)
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w.Write([]byte("403 - Forbidden"))
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return
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}
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nd, err := core.Resolve(ctx, i.node, path.Path(urlPath))
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if err != nil {
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webError(w, "Path Resolve error", err, http.StatusBadRequest)
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return
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}
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etag := gopath.Base(urlPath)
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if r.Header.Get("If-None-Match") == etag {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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w.Header().Set("X-IPFS-Path", urlPath)
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// Suborigin header, sandboxes apps from each other in the browser (even
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// though they are served from the same gateway domain). NOTE: This is not
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// yet widely supported by browsers.
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pathRoot := strings.SplitN(urlPath, "/", 4)[2]
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w.Header().Set("Suborigin", pathRoot)
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dr, err := uio.NewDagReader(ctx, nd, i.node.DAG)
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if err != nil && err != uio.ErrIsDir {
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// not a directory and still an error
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internalWebError(w, err)
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return
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}
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// set these headers _after_ the error, for we may just not have it
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// and dont want the client to cache a 500 response...
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// and only if it's /ipfs!
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// TODO: break this out when we split /ipfs /ipns routes.
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modtime := time.Now()
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if strings.HasPrefix(urlPath, ipfsPathPrefix) {
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w.Header().Set("Etag", etag)
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w.Header().Set("Cache-Control", "public, max-age=29030400")
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// set modtime to a really long time ago, since files are immutable and should stay cached
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modtime = time.Unix(1, 0)
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}
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if err == nil {
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defer dr.Close()
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_, name := gopath.Split(urlPath)
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http.ServeContent(w, r, name, modtime, dr)
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return
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}
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// storage for directory listing
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var dirListing []directoryItem
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// loop through files
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foundIndex := false
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for _, link := range nd.Links {
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if link.Name == "index.html" {
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if urlPath[len(urlPath)-1] != '/' {
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http.Redirect(w, r, urlPath+"/", 302)
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return
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}
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log.Debug("found index")
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foundIndex = true
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// return index page instead.
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nd, err := core.Resolve(ctx, i.node, path.Path(urlPath+"/index.html"))
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if err != nil {
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internalWebError(w, err)
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return
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}
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dr, err := uio.NewDagReader(ctx, nd, i.node.DAG)
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if err != nil {
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internalWebError(w, err)
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return
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}
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defer dr.Close()
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// write to request
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if r.Method != "HEAD" {
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io.Copy(w, dr)
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}
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break
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}
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di := directoryItem{link.Size, link.Name, gopath.Join(urlPath, link.Name)}
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dirListing = append(dirListing, di)
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}
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if !foundIndex {
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if r.Method != "HEAD" {
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// construct the correct back link
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// https://github.com/ipfs/go-ipfs/issues/1365
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var backLink string = r.URL.Path
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// don't go further up than /ipfs/$hash/
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pathSplit := strings.Split(backLink, "/")
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switch {
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// keep backlink
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case len(pathSplit) == 3: // url: /ipfs/$hash
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// keep backlink
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case len(pathSplit) == 4 && pathSplit[3] == "": // url: /ipfs/$hash/
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// add the correct link depending on wether the path ends with a slash
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default:
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if strings.HasSuffix(backLink, "/") {
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backLink += "./.."
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} else {
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backLink += "/.."
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}
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}
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tplData := listingTemplateData{
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Listing: dirListing,
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Path: urlPath,
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BackLink: backLink,
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}
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err := listingTemplate.Execute(w, tplData)
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if err != nil {
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internalWebError(w, err)
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return
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}
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}
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}
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}
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func (i *gatewayHandler) postHandler(w http.ResponseWriter, r *http.Request) {
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nd, err := i.newDagFromReader(r.Body)
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if err != nil {
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internalWebError(w, err)
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return
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}
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k, err := i.node.DAG.Add(nd)
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if err != nil {
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internalWebError(w, err)
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return
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}
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w.Header().Set("IPFS-Hash", k.String())
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http.Redirect(w, r, ipfsPathPrefix+k.String(), http.StatusCreated)
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}
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func (i *gatewayHandler) putEmptyDirHandler(w http.ResponseWriter, r *http.Request) {
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newnode := uio.NewEmptyDirectory()
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key, err := i.node.DAG.Add(newnode)
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if err != nil {
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webError(w, "Could not recursively add new node", err, http.StatusInternalServerError)
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return
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}
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w.Header().Set("IPFS-Hash", key.String())
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http.Redirect(w, r, ipfsPathPrefix+key.String()+"/", http.StatusCreated)
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}
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func (i *gatewayHandler) putHandler(w http.ResponseWriter, r *http.Request) {
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// TODO(cryptix): either ask mildred about the flow of this or rewrite it
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webErrorWithCode(w, "Sorry, PUT is bugged right now, closing request", errors.New("handler disabled"), http.StatusInternalServerError)
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return
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urlPath := r.URL.Path
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pathext := urlPath[5:]
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var err error
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if urlPath == ipfsPathPrefix+"QmUNLLsPACCz1vLxQVkXqqLX5R1X345qqfHbsf67hvA3Nn/" {
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i.putEmptyDirHandler(w, r)
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return
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}
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var newnode *dag.Node
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if pathext[len(pathext)-1] == '/' {
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newnode = uio.NewEmptyDirectory()
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} else {
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newnode, err = i.newDagFromReader(r.Body)
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if err != nil {
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webError(w, "Could not create DAG from request", err, http.StatusInternalServerError)
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return
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}
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}
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ctx, cancel := context.WithCancel(i.node.Context())
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defer cancel()
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ipfsNode, err := core.Resolve(ctx, i.node, path.Path(urlPath))
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if err != nil {
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// FIXME HTTP error code
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webError(w, "Could not resolve name", err, http.StatusInternalServerError)
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return
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}
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k, err := ipfsNode.Key()
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if err != nil {
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webError(w, "Could not get key from resolved node", err, http.StatusInternalServerError)
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return
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}
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h, components, err := path.SplitAbsPath(path.FromKey(k))
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if err != nil {
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webError(w, "Could not split path", err, http.StatusInternalServerError)
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return
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}
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if len(components) < 1 {
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err = fmt.Errorf("Cannot override existing object")
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webError(w, "http gateway", err, http.StatusBadRequest)
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return
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}
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tctx, cancel := context.WithTimeout(ctx, time.Minute)
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defer cancel()
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// TODO(cryptix): could this be core.Resolve() too?
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rootnd, err := i.node.Resolver.DAG.Get(tctx, key.Key(h))
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if err != nil {
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webError(w, "Could not resolve root object", err, http.StatusBadRequest)
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return
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}
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// resolving path components into merkledag nodes. if a component does not
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// resolve, create empty directories (which will be linked and populated below.)
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pathNodes, err := i.node.Resolver.ResolveLinks(tctx, rootnd, components[:len(components)-1])
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if _, ok := err.(path.ErrNoLink); ok {
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// Create empty directories, links will be made further down the code
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for len(pathNodes) < len(components) {
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pathNodes = append(pathNodes, uio.NewDirectory(i.node.DAG).GetNode())
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}
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} else if err != nil {
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webError(w, "Could not resolve parent object", err, http.StatusBadRequest)
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return
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}
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for i := len(pathNodes) - 1; i >= 0; i-- {
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newnode, err = pathNodes[i].UpdateNodeLink(components[i], newnode)
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if err != nil {
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webError(w, "Could not update node links", err, http.StatusInternalServerError)
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return
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}
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}
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err = i.node.DAG.AddRecursive(newnode)
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if err != nil {
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webError(w, "Could not add recursively new node", err, http.StatusInternalServerError)
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return
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}
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// Redirect to new path
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key, err := newnode.Key()
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if err != nil {
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webError(w, "Could not get key of new node", err, http.StatusInternalServerError)
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return
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}
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w.Header().Set("IPFS-Hash", key.String())
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http.Redirect(w, r, ipfsPathPrefix+key.String()+"/"+strings.Join(components, "/"), http.StatusCreated)
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}
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func (i *gatewayHandler) deleteHandler(w http.ResponseWriter, r *http.Request) {
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urlPath := r.URL.Path
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ctx, cancel := context.WithCancel(i.node.Context())
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defer cancel()
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ipfsNode, err := core.Resolve(ctx, i.node, path.Path(urlPath))
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if err != nil {
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// FIXME HTTP error code
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webError(w, "Could not resolve name", err, http.StatusInternalServerError)
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return
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}
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k, err := ipfsNode.Key()
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if err != nil {
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webError(w, "Could not get key from resolved node", err, http.StatusInternalServerError)
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return
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}
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h, components, err := path.SplitAbsPath(path.FromKey(k))
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if err != nil {
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webError(w, "Could not split path", err, http.StatusInternalServerError)
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return
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}
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tctx, cancel := context.WithTimeout(ctx, time.Minute)
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defer cancel()
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rootnd, err := i.node.Resolver.DAG.Get(tctx, key.Key(h))
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if err != nil {
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webError(w, "Could not resolve root object", err, http.StatusBadRequest)
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return
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}
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pathNodes, err := i.node.Resolver.ResolveLinks(tctx, rootnd, components[:len(components)-1])
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if err != nil {
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webError(w, "Could not resolve parent object", err, http.StatusBadRequest)
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return
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}
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// TODO(cyrptix): assumes len(pathNodes) > 1 - not found is an error above?
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err = pathNodes[len(pathNodes)-1].RemoveNodeLink(components[len(components)-1])
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if err != nil {
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webError(w, "Could not delete link", err, http.StatusBadRequest)
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return
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}
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newnode := pathNodes[len(pathNodes)-1]
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for i := len(pathNodes) - 2; i >= 0; i-- {
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newnode, err = pathNodes[i].UpdateNodeLink(components[i], newnode)
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if err != nil {
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webError(w, "Could not update node links", err, http.StatusInternalServerError)
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return
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}
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}
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err = i.node.DAG.AddRecursive(newnode)
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if err != nil {
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webError(w, "Could not add recursively new node", err, http.StatusInternalServerError)
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return
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}
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// Redirect to new path
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key, err := newnode.Key()
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if err != nil {
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webError(w, "Could not get key of new node", err, http.StatusInternalServerError)
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return
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}
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w.Header().Set("IPFS-Hash", key.String())
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http.Redirect(w, r, ipfsPathPrefix+key.String()+"/"+strings.Join(components[:len(components)-1], "/"), http.StatusCreated)
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}
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func webError(w http.ResponseWriter, message string, err error, defaultCode int) {
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if _, ok := err.(path.ErrNoLink); ok {
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webErrorWithCode(w, message, err, http.StatusNotFound)
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} else if err == routing.ErrNotFound {
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webErrorWithCode(w, message, err, http.StatusNotFound)
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} else if err == context.DeadlineExceeded {
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webErrorWithCode(w, message, err, http.StatusRequestTimeout)
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} else {
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webErrorWithCode(w, message, err, defaultCode)
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}
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}
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func webErrorWithCode(w http.ResponseWriter, message string, err error, code int) {
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w.WriteHeader(code)
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log.Errorf("%s: %s", message, err) // TODO(cryptix): log errors until we have a better way to expose these (counter metrics maybe)
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fmt.Fprintf(w, "%s: %s", message, err)
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}
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// return a 500 error and log
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func internalWebError(w http.ResponseWriter, err error) {
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webErrorWithCode(w, "internalWebError", err, http.StatusInternalServerError)
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}
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