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Merge pull request #541 from jbenet/gateway-server
Gateway Server
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,210 @@ | ||
| package main | ||
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| import ( | ||
| "html/template" | ||
| "io" | ||
| "mime" | ||
| "net/http" | ||
| "strings" | ||
|
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| "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context" | ||
| mh "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-multihash" | ||
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| core "github.com/jbenet/go-ipfs/core" | ||
| "github.com/jbenet/go-ipfs/importer" | ||
| chunk "github.com/jbenet/go-ipfs/importer/chunk" | ||
| dag "github.com/jbenet/go-ipfs/merkledag" | ||
| "github.com/jbenet/go-ipfs/routing" | ||
| uio "github.com/jbenet/go-ipfs/unixfs/io" | ||
| u "github.com/jbenet/go-ipfs/util" | ||
| ) | ||
|
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| type gateway interface { | ||
| ResolvePath(string) (*dag.Node, error) | ||
| NewDagFromReader(io.Reader) (*dag.Node, error) | ||
| AddNodeToDAG(nd *dag.Node) (u.Key, error) | ||
| NewDagReader(nd *dag.Node) (io.Reader, error) | ||
| } | ||
|
|
||
| // shortcut for templating | ||
| type webHandler map[string]interface{} | ||
|
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| // struct for directory listing | ||
| type directoryItem struct { | ||
| Size uint64 | ||
| Name string | ||
| } | ||
|
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| // gatewayHandler is a HTTP handler that serves IPFS objects (accessible by default at /ipfs/<path>) | ||
| // (it serves requests like GET /ipfs/QmVRzPKPzNtSrEzBFm2UZfxmPAgnaLke4DMcerbsGGSaFe/link) | ||
| type gatewayHandler struct { | ||
| node *core.IpfsNode | ||
| dirList *template.Template | ||
| } | ||
|
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| func NewGatewayHandler(node *core.IpfsNode) (*gatewayHandler, error) { | ||
| i := &gatewayHandler{ | ||
| node: node, | ||
| } | ||
| err := i.loadTemplate() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return i, nil | ||
| } | ||
|
|
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| // Load the directroy list template | ||
| func (i *gatewayHandler) loadTemplate() error { | ||
| t, err := template.New("dir").Parse(listingTemplate) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| i.dirList = t | ||
| return nil | ||
| } | ||
|
|
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| func (i *gatewayHandler) ResolvePath(path string) (*dag.Node, error) { | ||
| return i.node.Resolver.ResolvePath(path) | ||
| } | ||
|
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| func (i *gatewayHandler) NewDagFromReader(r io.Reader) (*dag.Node, error) { | ||
| return importer.BuildDagFromReader( | ||
| r, i.node.DAG, i.node.Pinning.GetManual(), chunk.DefaultSplitter) | ||
| } | ||
|
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| func (i *gatewayHandler) AddNodeToDAG(nd *dag.Node) (u.Key, error) { | ||
| return i.node.DAG.Add(nd) | ||
| } | ||
|
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| func (i *gatewayHandler) NewDagReader(nd *dag.Node) (io.Reader, error) { | ||
| return uio.NewDagReader(nd, i.node.DAG) | ||
| } | ||
|
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| func (i *gatewayHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| path := r.URL.Path[5:] | ||
| log := log.Prefix("serving %s", path) | ||
|
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| nd, err := i.ResolvePath(path) | ||
| if err != nil { | ||
| if err == routing.ErrNotFound { | ||
| w.WriteHeader(http.StatusNotFound) | ||
| } else if err == context.DeadlineExceeded { | ||
| w.WriteHeader(http.StatusRequestTimeout) | ||
| } else { | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| } | ||
|
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||
| log.Error(err) | ||
| w.Write([]byte(err.Error())) | ||
| return | ||
| } | ||
|
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| extensionIndex := strings.LastIndex(path, ".") | ||
| if extensionIndex != -1 { | ||
| extension := path[extensionIndex:] | ||
| mimeType := mime.TypeByExtension(extension) | ||
| if len(mimeType) > 0 { | ||
| w.Header().Add("Content-Type", mimeType) | ||
| } | ||
| } | ||
|
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||
| dr, err := i.NewDagReader(nd) | ||
| if err == nil { | ||
| io.Copy(w, dr) | ||
| return | ||
| } | ||
|
|
||
| if err != uio.ErrIsDir { | ||
| // not a directory and still an error | ||
| internalWebError(w, err) | ||
| return | ||
| } | ||
|
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| log.Debug("listing directory") | ||
| if path[len(path)-1:] != "/" { | ||
| log.Debug("missing trailing slash, redirect") | ||
| http.Redirect(w, r, "/ipfs/"+path+"/", 307) | ||
| return | ||
| } | ||
|
|
||
| // storage for directory listing | ||
| var dirListing []directoryItem | ||
| // loop through files | ||
| for _, link := range nd.Links { | ||
| if link.Name != "index.html" { | ||
| dirListing = append(dirListing, directoryItem{link.Size, link.Name}) | ||
| continue | ||
| } | ||
|
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| log.Debug("found index") | ||
| // return index page instead. | ||
| nd, err := i.ResolvePath(path + "/index.html") | ||
| if err != nil { | ||
| internalWebError(w, err) | ||
| return | ||
| } | ||
| dr, err := i.NewDagReader(nd) | ||
| if err != nil { | ||
| internalWebError(w, err) | ||
| return | ||
| } | ||
| // write to request | ||
| io.Copy(w, dr) | ||
| } | ||
|
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| // template and return directory listing | ||
| hndlr := webHandler{"listing": dirListing, "path": path} | ||
| if err := i.dirList.Execute(w, hndlr); err != nil { | ||
| internalWebError(w, err) | ||
| return | ||
| } | ||
| } | ||
|
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| func (i *gatewayHandler) postHandler(w http.ResponseWriter, r *http.Request) { | ||
| nd, err := i.NewDagFromReader(r.Body) | ||
| if err != nil { | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| log.Error(err) | ||
| w.Write([]byte(err.Error())) | ||
| return | ||
| } | ||
|
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| k, err := i.AddNodeToDAG(nd) | ||
| if err != nil { | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| log.Error(err) | ||
| w.Write([]byte(err.Error())) | ||
| return | ||
| } | ||
|
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| //TODO: return json representation of list instead | ||
| w.WriteHeader(http.StatusCreated) | ||
| w.Write([]byte(mh.Multihash(k).B58String())) | ||
| } | ||
|
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||
| // return a 500 error and log | ||
| func internalWebError(w http.ResponseWriter, err error) { | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| w.Write([]byte(err.Error())) | ||
| log.Error("%s", err) | ||
| } | ||
|
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||
| // Directory listing template | ||
| var listingTemplate = ` | ||
| <!DOCTYPE html> | ||
| <html> | ||
| <head> | ||
| <meta charset="utf-8" /> | ||
| <title>{{ .path }}</title> | ||
| </head> | ||
| <body> | ||
| <h2>Index of {{ .path }}</h2> | ||
| <ul> | ||
| <li><a href="./..">..</a></li> | ||
| {{ range $item := .listing }} | ||
| <li><a href="./{{ $item.Name }}">{{ $item.Name }}</a> - {{ $item.Size }} bytes</li> | ||
| {{ end }} | ||
| </ul> | ||
| </body> | ||
| </html> | ||
| ` |
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