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Merge pull request ipfs/kubo#9395 from ipfs/release-v0.17.0
release v0.17.0 This commit was moved from ipfs/kubo@4485d6b
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package corehttp | ||
|
|
||
| import ( | ||
| "context" | ||
| "html" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| files "github.com/ipfs/go-ipfs-files" | ||
| ipath "github.com/ipfs/interface-go-ipfs-core/path" | ||
| "github.com/ipfs/kubo/tracing" | ||
| "go.opentelemetry.io/otel/attribute" | ||
| "go.opentelemetry.io/otel/trace" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| var unixEpochTime = time.Unix(0, 0) | ||
|
|
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| func (i *gatewayHandler) serveTAR(ctx context.Context, w http.ResponseWriter, r *http.Request, resolvedPath ipath.Resolved, contentPath ipath.Path, begin time.Time, logger *zap.SugaredLogger) { | ||
| ctx, span := tracing.Span(ctx, "Gateway", "ServeTAR", trace.WithAttributes(attribute.String("path", resolvedPath.String()))) | ||
| defer span.End() | ||
|
|
||
| ctx, cancel := context.WithCancel(ctx) | ||
| defer cancel() | ||
|
|
||
| // Get Unixfs file | ||
| file, err := i.api.Unixfs().Get(ctx, resolvedPath) | ||
| if err != nil { | ||
| webError(w, "ipfs cat "+html.EscapeString(contentPath.String()), err, http.StatusBadRequest) | ||
| return | ||
| } | ||
| defer file.Close() | ||
|
|
||
| rootCid := resolvedPath.Cid() | ||
|
|
||
| // Set Cache-Control and read optional Last-Modified time | ||
| modtime := addCacheControlHeaders(w, r, contentPath, rootCid) | ||
|
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| // Weak Etag W/ because we can't guarantee byte-for-byte identical | ||
| // responses, but still want to benefit from HTTP Caching. Two TAR | ||
| // responses for the same CID will be logically equivalent, | ||
| // but when TAR is streamed, then in theory, files and directories | ||
| // may arrive in different order (depends on TAR lib and filesystem/inodes). | ||
| etag := `W/` + getEtag(r, rootCid) | ||
| w.Header().Set("Etag", etag) | ||
|
|
||
| // Finish early if Etag match | ||
| if r.Header.Get("If-None-Match") == etag { | ||
| w.WriteHeader(http.StatusNotModified) | ||
| return | ||
| } | ||
|
|
||
| // Set Content-Disposition | ||
| var name string | ||
| if urlFilename := r.URL.Query().Get("filename"); urlFilename != "" { | ||
| name = urlFilename | ||
| } else { | ||
| name = rootCid.String() + ".tar" | ||
| } | ||
| setContentDispositionHeader(w, name, "attachment") | ||
|
|
||
| // Construct the TAR writer | ||
| tarw, err := files.NewTarWriter(w) | ||
| if err != nil { | ||
| webError(w, "could not build tar writer", err, http.StatusInternalServerError) | ||
| return | ||
| } | ||
| defer tarw.Close() | ||
|
|
||
| // Sets correct Last-Modified header. This code is borrowed from the standard | ||
| // library (net/http/server.go) as we cannot use serveFile without throwing the entire | ||
| // TAR into the memory first. | ||
| if !(modtime.IsZero() || modtime.Equal(unixEpochTime)) { | ||
| w.Header().Set("Last-Modified", modtime.UTC().Format(http.TimeFormat)) | ||
| } | ||
|
|
||
| w.Header().Set("Content-Type", "application/x-tar") | ||
| w.Header().Set("X-Content-Type-Options", "nosniff") // no funny business in the browsers :^) | ||
|
|
||
| // The TAR has a top-level directory (or file) named by the CID. | ||
| if err := tarw.WriteFile(file, rootCid.String()); err != nil { | ||
| w.Header().Set("X-Stream-Error", err.Error()) | ||
| // Trailer headers do not work in web browsers | ||
| // (see https://github.com/mdn/browser-compat-data/issues/14703) | ||
| // and we have limited options around error handling in browser contexts. | ||
| // To improve UX/DX, we finish response stream with error message, allowing client to | ||
| // (1) detect error by having corrupted TAR | ||
| // (2) be able to reason what went wrong by instecting the tail of TAR stream | ||
| _, _ = w.Write([]byte(err.Error())) | ||
| return | ||
| } | ||
| } |
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