forked from ipfs/boxo
/
handler_defaults.go
186 lines (172 loc) · 5.8 KB
/
handler_defaults.go
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package gateway
import (
"context"
"errors"
"fmt"
"net/http"
"net/textproto"
"strconv"
"strings"
mc "github.com/multiformats/go-multicodec"
"github.com/stateless-minds/boxo/files"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
func (i *handler) serveDefaults(ctx context.Context, w http.ResponseWriter, r *http.Request, rq *requestData) bool {
ctx, span := spanTrace(ctx, "Handler.ServeDefaults", trace.WithAttributes(attribute.String("path", rq.contentPath.String())))
defer span.End()
var (
pathMetadata ContentPathMetadata
bytesResponse files.File
isDirectoryHeadRequest bool
directoryMetadata *directoryMetadata
err error
ranges []ByteRange
)
switch r.Method {
case http.MethodHead:
var data files.Node
pathMetadata, data, err = i.backend.Head(ctx, rq.mostlyResolvedPath())
if !i.handleRequestErrors(w, r, rq.contentPath, err) {
return false
}
defer data.Close()
if _, ok := data.(files.Directory); ok {
isDirectoryHeadRequest = true
} else if f, ok := data.(files.File); ok {
bytesResponse = f
} else {
i.webError(w, r, fmt.Errorf("unsupported response type"), http.StatusInternalServerError)
return false
}
case http.MethodGet:
rangeHeader := r.Header.Get("Range")
if rangeHeader != "" {
// TODO: Add tests for range parsing
ranges, err = parseRange(rangeHeader)
if err != nil {
i.webError(w, r, fmt.Errorf("invalid range request: %w", err), http.StatusBadRequest)
return false
}
}
var getResp *GetResponse
// TODO: passing only resolved path here, instead of contentPath is
// harming content routing. Knowing original immutableContentPath will
// allow backend to find providers for parents, even when internal
// CIDs are not announced, and will provide better key for caching
// related DAGs.
pathMetadata, getResp, err = i.backend.Get(ctx, rq.mostlyResolvedPath(), ranges...)
if err != nil {
if isWebRequest(rq.responseFormat) {
forwardedPath, continueProcessing := i.handleWebRequestErrors(w, r, rq.mostlyResolvedPath(), rq.immutablePath, rq.contentPath, err, rq.logger)
if !continueProcessing {
return false
}
pathMetadata, getResp, err = i.backend.Get(ctx, forwardedPath, ranges...)
if err != nil {
err = fmt.Errorf("failed to resolve %s: %w", debugStr(rq.contentPath.String()), err)
i.webError(w, r, err, http.StatusInternalServerError)
return false
}
} else {
if !i.handleRequestErrors(w, r, rq.contentPath, err) {
return false
}
}
}
if getResp.bytes != nil {
bytesResponse = getResp.bytes
defer bytesResponse.Close()
} else {
directoryMetadata = getResp.directoryMetadata
}
default:
// This shouldn't be possible to reach which is why it is a 500 rather than 4XX error
i.webError(w, r, fmt.Errorf("invalid method: cannot use this HTTP method with the given request"), http.StatusInternalServerError)
return false
}
setIpfsRootsHeader(w, rq, &pathMetadata)
resolvedPath := pathMetadata.LastSegment
switch mc.Code(resolvedPath.Cid().Prefix().Codec) {
case mc.Json, mc.DagJson, mc.Cbor, mc.DagCbor:
if bytesResponse == nil { // This should never happen
i.webError(w, r, fmt.Errorf("decoding error: data not usable as a file"), http.StatusInternalServerError)
return false
}
rq.logger.Debugw("serving codec", "path", rq.contentPath)
return i.renderCodec(r.Context(), w, r, rq, bytesResponse)
default:
rq.logger.Debugw("serving unixfs", "path", rq.contentPath)
ctx, span := spanTrace(ctx, "Handler.ServeUnixFS", trace.WithAttributes(attribute.String("path", resolvedPath.String())))
defer span.End()
// Handling Unixfs file
if bytesResponse != nil {
rq.logger.Debugw("serving unixfs file", "path", rq.contentPath)
return i.serveFile(ctx, w, r, resolvedPath, rq.contentPath, bytesResponse, pathMetadata.ContentType, rq.begin)
}
// Handling Unixfs directory
if directoryMetadata != nil || isDirectoryHeadRequest {
rq.logger.Debugw("serving unixfs directory", "path", rq.contentPath)
return i.serveDirectory(ctx, w, r, resolvedPath, rq.contentPath, isDirectoryHeadRequest, directoryMetadata, ranges, rq.begin, rq.logger)
}
i.webError(w, r, fmt.Errorf("unsupported UnixFS type"), http.StatusInternalServerError)
return false
}
}
// parseRange parses a Range header string as per RFC 7233.
func parseRange(s string) ([]ByteRange, error) {
if s == "" {
return nil, nil // header not present
}
const b = "bytes="
if !strings.HasPrefix(s, b) {
return nil, errors.New("invalid range")
}
var ranges []ByteRange
for _, ra := range strings.Split(s[len(b):], ",") {
ra = textproto.TrimString(ra)
if ra == "" {
continue
}
start, end, ok := strings.Cut(ra, "-")
if !ok {
return nil, errors.New("invalid range")
}
start, end = textproto.TrimString(start), textproto.TrimString(end)
var r ByteRange
if start == "" {
r.From = 0
// If no start is specified, end specifies the
// range start relative to the end of the file,
// and we are dealing with <suffix-length>
// which has to be a non-negative integer as per
// RFC 7233 Section 2.1 "Byte-Ranges".
if end == "" || end[0] == '-' {
return nil, errors.New("invalid range")
}
i, err := strconv.ParseInt(end, 10, 64)
if i < 0 || err != nil {
return nil, errors.New("invalid range")
}
r.To = &i
} else {
i, err := strconv.ParseUint(start, 10, 64)
if err != nil {
return nil, errors.New("invalid range")
}
r.From = i
if end == "" {
// If no end is specified, range extends to end of the file.
r.To = nil
} else {
i, err := strconv.ParseInt(end, 10, 64)
if err != nil || i < 0 || r.From > uint64(i) {
return nil, errors.New("invalid range")
}
r.To = &i
}
}
ranges = append(ranges, r)
}
return ranges, nil
}