158 lines
3.7 KiB
Go
158 lines
3.7 KiB
Go
// Copyright (c) 2020 Tulir Asokan
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package id
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import (
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"bytes"
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"database/sql/driver"
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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)
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var (
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InvalidContentURI = errors.New("invalid Matrix content URI")
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InputNotJSONString = errors.New("input doesn't look like a JSON string")
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)
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// ContentURIString is a string that's expected to be a Matrix content URI.
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// It's useful for delaying the parsing of the content URI to move errors from the event content
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// JSON parsing step to a later step where more appropriate errors can be produced.
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type ContentURIString string
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func (uriString ContentURIString) Parse() (ContentURI, error) {
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return ParseContentURI(string(uriString))
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}
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func (uriString ContentURIString) ParseOrIgnore() ContentURI {
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parsed, _ := ParseContentURI(string(uriString))
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return parsed
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}
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// ContentURI represents a Matrix content URI.
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// https://spec.matrix.org/v1.2/client-server-api/#matrix-content-mxc-uris
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type ContentURI struct {
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Homeserver string
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FileID string
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}
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func MustParseContentURI(uri string) ContentURI {
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parsed, err := ParseContentURI(uri)
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if err != nil {
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panic(err)
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}
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return parsed
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}
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// ParseContentURI parses a Matrix content URI.
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func ParseContentURI(uri string) (parsed ContentURI, err error) {
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if len(uri) == 0 {
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return
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} else if !strings.HasPrefix(uri, "mxc://") {
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err = InvalidContentURI
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} else if index := strings.IndexRune(uri[6:], '/'); index == -1 || index == len(uri)-7 {
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err = InvalidContentURI
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} else {
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parsed.Homeserver = uri[6 : 6+index]
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parsed.FileID = uri[6+index+1:]
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}
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return
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}
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var mxcBytes = []byte("mxc://")
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func ParseContentURIBytes(uri []byte) (parsed ContentURI, err error) {
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if len(uri) == 0 {
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return
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} else if !bytes.HasPrefix(uri, mxcBytes) {
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err = InvalidContentURI
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} else if index := bytes.IndexRune(uri[6:], '/'); index == -1 || index == len(uri)-7 {
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err = InvalidContentURI
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} else {
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parsed.Homeserver = string(uri[6 : 6+index])
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parsed.FileID = string(uri[6+index+1:])
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}
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return
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}
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func (uri *ContentURI) UnmarshalJSON(raw []byte) (err error) {
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if string(raw) == "null" {
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*uri = ContentURI{}
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return nil
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} else if len(raw) < 2 || raw[0] != '"' || raw[len(raw)-1] != '"' {
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return InputNotJSONString
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}
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parsed, err := ParseContentURIBytes(raw[1 : len(raw)-1])
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if err != nil {
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return err
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}
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*uri = parsed
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return nil
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}
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func (uri *ContentURI) MarshalJSON() ([]byte, error) {
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if uri == nil || uri.IsEmpty() {
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return []byte("null"), nil
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}
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return json.Marshal(uri.String())
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}
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func (uri *ContentURI) UnmarshalText(raw []byte) (err error) {
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parsed, err := ParseContentURIBytes(raw)
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if err != nil {
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return err
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}
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*uri = parsed
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return nil
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}
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func (uri ContentURI) MarshalText() ([]byte, error) {
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return []byte(uri.String()), nil
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}
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func (uri *ContentURI) Scan(i interface{}) error {
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var parsed ContentURI
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var err error
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switch value := i.(type) {
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case nil:
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// don't do anything, set uri to empty
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case []byte:
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parsed, err = ParseContentURIBytes(value)
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case string:
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parsed, err = ParseContentURI(value)
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default:
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return fmt.Errorf("invalid type %T for ContentURI.Scan", i)
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}
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if err != nil {
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return err
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}
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*uri = parsed
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return nil
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}
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func (uri *ContentURI) Value() (driver.Value, error) {
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if uri == nil {
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return nil, nil
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}
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return uri.String(), nil
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}
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func (uri ContentURI) String() string {
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if uri.IsEmpty() {
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return ""
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}
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return fmt.Sprintf("mxc://%s/%s", uri.Homeserver, uri.FileID)
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}
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func (uri ContentURI) CUString() ContentURIString {
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return ContentURIString(uri.String())
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}
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func (uri ContentURI) IsEmpty() bool {
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return len(uri.Homeserver) == 0 || len(uri.FileID) == 0
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}
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