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map.go
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map.go
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package main
import (
"context"
"encoding/json"
"net/http"
"path"
"path/filepath"
"regexp"
"strings"
"cloud.google.com/go/storage"
"google.golang.org/api/iterator"
)
type mapping struct {
Sequences []sequence `json:"sequences"`
}
type sequence struct {
Clips []clip `json:"clips"`
}
type clip struct {
Type string `json:"type"`
Path string `json:"path"`
}
func getMapHandler(c Config, client *storage.Client) http.HandlerFunc {
bucketHandle := client.Bucket(c.BucketName)
logger := c.logger()
return func(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
if r.Method != http.MethodGet {
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
var ext string
prefix := strings.TrimLeft(r.URL.Path, "/")
if c.MapExtensionSplit {
ext = filepath.Ext(prefix)
prefix = prefix[:len(prefix)-len(ext)]
}
if prefix == "" {
http.Error(w, "prefix cannot be empty", http.StatusBadRequest)
return
}
m, err := getPrefixMapping(prefix, ext, c, bucketHandle)
if err != nil && err != iterator.Done {
logger.WithError(err).WithField("prefix", prefix).Error("failed to map request")
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
m = appendExtraResources(r, c, m)
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(m)
}
}
func appendExtraResources(r *http.Request, config Config, m mapping) mapping {
resources := r.URL.Query().Get(config.ExtraResourcesToken)
for _, resource := range strings.Split(resources, ",") {
if resource != "" {
m.Sequences = append(m.Sequences, sequence{
Clips: []clip{{Type: "source", Path: resource}},
})
}
}
return m
}
func getPrefixMapping(prefix, ext string, config Config, bucketHandle *storage.BucketHandle) (mapping, error) {
m := mapping{Sequences: []sequence{}}
for _, p := range getPrefixes(prefix, config) {
sequences, err := expandPrefix(p, ext, config, bucketHandle)
if err != nil {
return m, err
}
m.Sequences = append(m.Sequences, sequences...)
}
return m, nil
}
func getPrefixes(originalPrefix string, config Config) []string {
prefixes := []string{originalPrefix}
_, lastPart := path.Split(originalPrefix)
for _, p := range config.MapExtraPrefixes {
prefixes = append(prefixes, path.Join(p, lastPart))
}
return prefixes
}
func expandPrefix(prefix, ext string, config Config, bucketHandle *storage.BucketHandle) ([]sequence, error) {
var err error
var filterRegex string
if strings.Contains(prefix, "__HD") {
filterRegex = config.MapRegexHDFilter
prefix = strings.Replace(prefix, "__HD", "", 1)
} else if ext != "" {
filterRegex = regexp.QuoteMeta(ext) + "$"
} else {
filterRegex = config.MapRegexFilter
}
for i := 0; i < maxTry; i++ {
iter := bucketHandle.Objects(context.Background(), &storage.Query{
Prefix: prefix,
Delimiter: "/",
})
var obj *storage.ObjectAttrs
sequences := []sequence{}
obj, err = iter.Next()
for ; err == nil; obj, err = iter.Next() {
filename := path.Base(obj.Name)
matched, _ := regexp.MatchString(filterRegex, filename)
if matched {
sequences = append(sequences, sequence{
Clips: []clip{{Type: "source", Path: "/" + obj.Bucket + "/" + obj.Name}},
})
}
}
if err == iterator.Done {
return sequences, nil
}
}
return nil, err
}