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toot/toot.go

@@ -0,0 +1,107 @@
+package toot
+
+import "fmt"
+import "encoding/json"
+import "errors"
+import "strings"
+import "github.com/sneak/feta/jsonapis"
+import "github.com/davecgh/go-spew/spew"
+import "github.com/rs/zerolog/log"
+
+//import "encoding/hex"
+import mh "github.com/multiformats/go-multihash"
+import mhopts "github.com/multiformats/go-multihash/opts"
+
+type TootHash string
+
+type Toot struct {
+	Original []byte
+	Parsed   *jsonapis.APISerializedToot
+	Hash     TootHash
+	FromHost string
+}
+
+func NewTootCollectionFromMastodonAPIResponse(in []byte, hostname string) (*[]Toot, error) {
+	var rt []json.RawMessage
+	err := json.Unmarshal(in, &rt)
+	if err != nil {
+		return nil, errors.New("unable to parse api response")
+	}
+
+	var tc []Toot
+
+	// iterate over rawtoots from api
+	for _, item := range rt {
+		parsed := new(jsonapis.APISerializedToot)
+		err := json.Unmarshal(item, parsed)
+		if err != nil {
+			log.Error().Msg("unable to parse toot, skipping")
+			continue
+		}
+		t := new(Toot)
+		t.Parsed = parsed
+		o, err := item.MarshalJSON()
+		if err != nil {
+			panic(err)
+		}
+		t.Original = o
+		t.FromHost = hostname
+		t.calcHash()
+		tc = append(tc, *t)
+	}
+	spew.Dump(tc)
+	panic("")
+	return &tc, nil
+}
+
+func (t *Toot) String() string {
+	return fmt.Sprintf("%#v", t)
+}
+
+func (t *Toot) multiHash(in []byte) string {
+	opts := new(mhopts.Options)
+	opts.Algorithm = "sha2-256"
+	opts.Encoding = "base58"
+	var found bool
+	opts.AlgorithmCode, found = mh.Names[opts.Algorithm]
+	if !found {
+		panic("oops")
+	}
+	opts.Length = mh.DefaultLengths[opts.AlgorithmCode]
+	r := strings.NewReader(string(in))
+	h, err := opts.Multihash(r)
+	if err != nil {
+		panic(err)
+	}
+	return h.B58String()
+}
+
+func (t *Toot) DiskStoragePath() string {
+	// FIXME make this error if fields are missing
+	// '/YYYYMMDD/example.com/username/YYYY-MM-DD.HHMMSS.username@fromHost.multihash.json'
+	return fmt.Sprintf("%s/%s/%s/%s.%s@%s.%s.json",
+		t.Parsed.CreatedAt.Format("20060102"),
+		strings.ToLower(t.FromHost),
+		t.Parsed.Account.Acct,
+		t.Parsed.CreatedAt.Format("2006-01-02.150405"),
+		t.Parsed.Account.Acct,
+		strings.ToLower(t.FromHost),
+		t.Hash,
+	)
+}
+
+func (t *Toot) identityHashInput() string {
+	return fmt.Sprintf(
+		"%s.%s.%s.%s.%s",
+		t.Parsed.Account.URL,
+		t.Parsed.CreatedAt,
+		t.Parsed.ID,
+		t.Parsed.Content,
+		strings.ToLower(t.FromHost),
+	)
+}
+
+func (t *Toot) calcHash() {
+	hi := t.identityHashInput()
+	t.Hash = TootHash(t.multiHash([]byte(hi)))
+}