docs/api: update to reflect new request/response schema

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# cobalt api documentation
this document provides info about methods and acceptable variables for all cobalt api requests.
this document provides info about methods and acceptable variables for all cobalt api requests.
<!-- TODO: authorization -->
## POST: `/`
cobalt's main processing endpoint.
request body type: `application/json`
response body type: `application/json`
```
👍 you can use api.cobalt.tools in your projects for free, just don't be an asshole.
```
## POST: `/api/json`
cobalt's main processing endpoint.
request body type: `application/json`
response body type: `application/json`
```
⚠️ you must include Accept and Content-Type headers with every POST /api/json request.
⚠️ you must include Accept and Content-Type headers with every `POST /` request.
Accept: application/json
Content-Type: application/json
```
### request body variables
| key | type | variables | default | description |
|:------------------|:----------|:-----------------------------------|:----------|:--------------------------------------------------------------------------------|
| `url` | `string` | URL encoded as URI | `null` | **must** be included in every request. |
| `vCodec` | `string` | `h264 / av1 / vp9` | `h264` | applies only to youtube downloads. `h264` is recommended for phones. |
| `vQuality` | `string` | `144 / ... / 2160 / max` | `720` | `720` quality is recommended for phones. |
| `aFormat` | `string` | `best / mp3 / ogg / wav / opus` | `mp3` | |
| `filenamePattern` | `string` | `classic / pretty / basic / nerdy` | `classic` | changes the way files are named. previews can be seen in the web app. |
| `isAudioOnly` | `boolean` | `true / false` | `false` | |
| `isTTFullAudio` | `boolean` | `true / false` | `false` | enables download of original sound used in a tiktok video. |
| `isAudioMuted` | `boolean` | `true / false` | `false` | disables audio track in video downloads. |
| `dubLang` | `boolean` | `true / false` | `false` | backend uses Accept-Language header for youtube video audio tracks when `true`. |
| `disableMetadata` | `boolean` | `true / false` | `false` | disables file metadata when set to `true`. |
| `twitterGif` | `boolean` | `true / false` | `false` | changes whether twitter gifs are converted to .gif |
| `tiktokH265` | `boolean` | `true / false` | `false` | changes whether 1080p h265 videos are preferred or not. |
### request body
| key | type | expected value(s) | default | description |
|:-----------------------------|:----------|:-----------------------------------|:----------|:--------------------------------------------------------------------------------|
| `url` | `string` | URL encoded as URI | `null` | **must** be included in every request. |
| `videoQuality` | `string` | `144 / ... / 2160 / 4320 / max` | `1080` | `720` quality is recommended for phones. |
| `audioFormat` | `string` | `best / mp3 / ogg / wav / opus` | `mp3` | |
| `audioBitrate` | `string` | `320 / 256 / 128 / 96 / 64 / 8` | `128` | specifies the bitrate to use for the audio. applies only to audio conversion. |
| `filenameStyle` | `string` | `classic / pretty / basic / nerdy` | `classic` | changes the way files are named. previews can be seen in the web app. |
| `downloadMode` | `string` | `auto / audio / mute` | `auto` | `audio` downloads only the audio, `mute` skips the audio track in videos. |
| `youtubeVideoCodec` | `string` | `h264 / av1 / vp9` | `h264` | `h264` is recommended for phones. |
| `youtubeDubLang` | `string` | `en / ru / cs / ja / ...` | -- | specifies the language of audio to download, when the youtube video is dubbed |
| `youtubeDubBrowserLang` | `boolean` | `true / false` | `false` | uses value from the Accept-Language header for `youtubeDubLang`. |
| `alwaysProxy` | `boolean` | `true / false` | `false` | tunnels all downloads through the processing server, even when not necessary. |
| `disableMetadata` | `boolean` | `true / false` | `false` | disables file metadata when set to `true`. |
| `tiktokFullAudio` | `boolean` | `true / false` | `false` | enables download of original sound used in a tiktok video. |
| `tiktokH265` | `boolean` | `true / false` | `false` | changes whether 1080p h265 videos are preferred or not. |
| `twitterGif` | `boolean` | `true / false` | `true` | changes whether twitter gifs are converted to .gif |
### response body variables
| key | type | variables |
### response
the response will always be a JSON object containing the `status` key, which will be one of:
- `error` - something went wrong
- `picker` - we have multiple items to choose from
- `redirect` - you are being redirected to the direct service URL
- `stream` - cobalt is proxying the download for you
### stream/redirect response
| key | type | values |
|:-------------|:---------|:------------------------------------------------------------|
| `status` | `string` | `error / redirect / stream / success / rate-limit / picker` |
| `text` | `string` | various text, mostly used for errors |
| `url` | `string` | direct link to a file or a link to cobalt's live render |
| `pickerType` | `string` | `various / images` |
| `picker` | `array` | array of picker items |
| `audio` | `string` | direct link to a file or a link to cobalt's live render |
| `status` | `string` | `stream / redirect` |
| `url` | `string` | url for the cobalt stream, or redirect to an external link |
### picker item variables
item type: `object`
### picker response
| key | type | values |
|:-------------|:---------|:------------------------------------------------------------|
| `status` | `string` | `picker` |
| `picker` | `array` | array of objects containing the individual media |
| key | type | variables | description |
|:--------|:---------|:--------------------------------------------------------|:---------------------------------------|
| `type` | `string` | `video / photo / gif` | used only if `pickerType` is `various` |
| `url` | `string` | direct link to a file or a link to cobalt's live render | |
| `thumb` | `string` | item thumbnail that's displayed in the picker | used for `video` and `gif` types |
#### picker object
| key | type | values |
|:-------------|:----------|:------------------------------------------------------------|
| `type` | `string` | `photo` / `video` / `gif` |
| `url` | `string` | |
| `thumb` | `string` | **optional** thumbnail url |
## GET: `/api/stream`
cobalt's live render (or stream) endpoint. usually, you will receive a url to this endpoint
from a successful call to `/api/json`. however, the parameters passed to it are **opaque**
and **unmodifiable** from your (the api client's) perspective, and can change between versions.
### error response
| key | type | values |
|:-------------|:---------|:------------------------------------------------------------|
| `status` | `string` | `error` |
| `error` | `object` | contains more context about the error |
therefore you don't need to worry about what they mean - but if you really want to know, you can
[read the source code](/src/modules/stream/manage.js).
#### error object
| key | type | values |
|:-------------|:---------|:------------------------------------------------------------|
| `code` | `string` | machine-readable error code explaining the failure reason |
| `context` | `object` | **optional** container for providing more context |
## GET: `/api/serverInfo`
returns current basic server info.
#### error.context object
| key | type | values |
|:-------------|:---------|:---------------------------------------------------------------------------------------------------------------|
| `service` | `string` | **optional**, stating which service was being downloaded from |
| `limit` | `number` | **optional** number providing the ratelimit maximum number of requests, or maximum downloadable video duration |
## GET: `/`
returns current basic server info.
response body type: `application/json`
### response body variables
### response body
| key | type | variables |
|:------------|:---------|:---------------------------------------------------------|
| `cobalt` | `object` | information about the cobalt instance |
| `git` | `object` | information about the codebase that is currently running |
#### cobalt object
| key | type | description |
|:----------------|:-----------|:-----------------------------------------------|
| `version` | `string` | current version |
| `url` | `string` | server url |
| `startTime` | `string` | server start time in unix milliseconds |
| `durationLimit` | `number` | maximum downloadable video length in seconds |
| `services` | `string[]` | array of services which this instance supports |
#### git object
| key | type | variables |
|:------------|:---------|:------------------|
| `version` | `string` | cobalt version |
| `commit` | `string` | git commit |
| `commit` | `string` | commit hash |
| `branch` | `string` | git branch |
| `name` | `string` | server name |
| `url` | `string` | server url |
| `cors` | `number` | cors status |
| `startTime` | `string` | server start time |
| `remote` | `string` | git remote |