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mediaapi/writers/download: Allow only media IDs matching [A-Za-z0-9_=-]+
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@ -16,7 +16,9 @@ package writers
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"regexp"
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log "github.com/Sirupsen/logrus"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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@ -26,6 +28,11 @@ import (
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"github.com/matrix-org/util"
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)
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const mediaIDCharacters = "A-Za-z0-9_=-"
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// Note: unfortunately regex.MustCompile() cannot be assigned to a const
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var mediaIDRegex = regexp.MustCompile("[" + mediaIDCharacters + "]+")
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// downloadRequest metadata included in or derivable from an download request
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// https://matrix.org/docs/spec/client_server/r0.2.0.html#get-matrix-media-r0-download-servername-mediaid
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type downloadRequest struct {
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@ -78,11 +85,10 @@ func (r *downloadRequest) jsonErrorResponse(w http.ResponseWriter, res util.JSON
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// Validate validates the downloadRequest fields
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func (r *downloadRequest) Validate() *util.JSONResponse {
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// maybe give the URL pattern in the routing, these are not even possible as the handler would not be hit...?
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if r.MediaMetadata.MediaID == "" {
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if mediaIDRegex.MatchString(string(r.MediaMetadata.MediaID)) == false {
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return &util.JSONResponse{
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Code: 404,
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JSON: jsonerror.NotFound("mediaId must be a non-empty string"),
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JSON: jsonerror.NotFound(fmt.Sprintf("mediaId must be a non-empty string using only characters in %v", mediaIDCharacters)),
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}
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}
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if r.MediaMetadata.Origin == "" {
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