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routes.go
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routes.go
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package main
import (
"fmt"
cyphar "github.com/cyphar/filepath-securejoin"
"github.com/go-chi/chi"
"github.com/go-chi/render"
"github.com/rs/zerolog/log"
"io/ioutil"
"net/http"
"os"
"strings"
)
// https://matrix.org/docs/spec/client_server/latest#get-well-known-matrix-client
// https://matrix.org/docs/spec/server_server/latest#get-well-known-matrix-server
func SchemaLookupRoute(w http.ResponseWriter, r *http.Request) {
// Extract the requested schema taret
target := chi.URLParam(r, "target")
if target != "server" && target != "client" {
log.Info().Str("target", target).Msg("Invalid schema target requested")
w.WriteHeader(400)
}
config := r.Context().Value("Config").(*Config)
// Extract host name only, remove possible port
host := strings.Split(r.Host, ":")[0]
// Create secured file path to possible schema file
schema, err := cyphar.SecureJoin(config.SchemaRoot, host)
schema = fmt.Sprintf("%s.%s.json", schema, target)
// Detect invalid paths and exit
if err != nil {
log.Warn().Err(err).Str("schema", schema).Str("host", host).Msg("Invalid request path detected")
w.WriteHeader(400)
}
// Detect undefined schemas
if _, err := os.Stat(schema); os.IsNotExist(err) {
w.WriteHeader(404)
return
}
render.SetContentType(render.ContentTypeJSON)
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
json, err := ioutil.ReadFile(schema)
if err != nil {
log.Error().Err(err).Str("schema", schema).Msg("Failed to read the resolved schema file")
}
_, err = w.Write(json)
if err != nil {
log.Error().Err(err).Str("schema", schema).Msg("Failed to write the resolved schema file to http writer")
}
}