[feature] Add description_limit to /api/v2/instance, increase default limit to 5k (#4140)

Closes https://codeberg.org/superseriousbusiness/gotosocial/issues/4131 by adding `description_limit` to the `api/v2/instance` response. Also increases default sizes to default status length to allow people to more easily describe things like screenshots of text.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4140
Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Co-committed-by: tobi <tobi.smethurst@protonmail.com>

docs/api/swagger.yaml

@@ -1593,6 +1593,23 @@ definitions:
         x-go-package: code.superseriousbusiness.org/gotosocial/internal/api/model
     instanceConfigurationMediaAttachments:
         properties:
+            description_limit:
+                description: |-
+                    The maximum size of a description, in characters.
+                    Omitted for /api/v1/instance response.
+                example: 5000
+                format: int64
+                type: integer
+                x-go-name: DescriptionLimit
+            description_minimum:
+                description: |-
+                    The minimum size required for a description, in characters.
+                    Omitted if zero/not set.
+                    Omitted for /api/v1/instance response.
+                example: 200
+                format: int64
+                type: integer
+                x-go-name: DescriptionMinimum
             image_matrix_limit:
                 description: |-
                     Max allowed image size in pixels as height*width.

docs/configuration/media.md

@@ -50,9 +50,9 @@ media-remote-max-size: 40MiB
 media-description-min-chars: 0
 
 # Int. Maximum amount of characters permitted in an image or video description.
-# Examples: [1000, 1500, 3000]
-# Default: 1500
-media-description-max-chars: 1500
+# Examples: [1000, 5000, 10000]
+# Default: 5000
+media-description-max-chars: 5000
 
 # Size. Max size in bytes of emojis uploaded to this instance via the admin API.
 #

example/config.yaml

@@ -580,9 +580,9 @@ media-remote-max-size: 40MiB
 media-description-min-chars: 0
 
 # Int. Maximum amount of characters permitted in an image or video description.
-# Examples: [1000, 1500, 3000]
-# Default: 1500
-media-description-max-chars: 1500
+# Examples: [1000, 5000, 10000]
+# Default: 5000
+media-description-max-chars: 5000
 
 # Size. Max size in bytes of emojis uploaded to this instance via the admin API.
 #

internal/api/model/instance.go

@@ -120,6 +120,17 @@ type InstanceConfigurationMediaAttachments struct {
 	//
 	// example: 16777216
 	VideoMatrixLimit int `json:"video_matrix_limit"`
+	// The maximum size of a description, in characters.
+	// Omitted for /api/v1/instance response.
+	//
+	// example: 5000
+	DescriptionLimit int `json:"description_limit,omitempty"`
+	// The minimum size required for a description, in characters.
+	// Omitted if zero/not set.
+	// Omitted for /api/v1/instance response.
+	//
+	// example: 200
+	DescriptionMinimum int `json:"description_minimum,omitempty"`
 }
 
 // InstanceConfigurationPolls models instance poll config parameters.

internal/typeutils/internaltofrontend.go

@@ -1966,6 +1966,8 @@ func (c *Converter) InstanceToAPIV2Instance(ctx context.Context, i *gtsmodel.Ins
 	instance.Configuration.Statuses.CharactersReservedPerURL = instanceStatusesCharactersReservedPerURL
 	instance.Configuration.Statuses.SupportedMimeTypes = instanceStatusesSupportedMimeTypes
 	instance.Configuration.MediaAttachments.SupportedMimeTypes = media.SupportedMIMETypes
+	instance.Configuration.MediaAttachments.DescriptionLimit = config.GetMediaDescriptionMaxChars()
+	instance.Configuration.MediaAttachments.DescriptionMinimum = config.GetMediaDescriptionMinChars()
 
 	// NOTE: we use the local max sizes here
 	// as it hints to apps like Tusky for image

internal/typeutils/internaltofrontend_test.go

@@ -2501,7 +2501,8 @@ func (suite *InternalToFrontendTestSuite) TestInstanceV2ToFrontend() {
       "image_matrix_limit": 2147483647,
       "video_size_limit": 41943040,
       "video_frame_rate_limit": 2147483647,
-      "video_matrix_limit": 2147483647
+      "video_matrix_limit": 2147483647,
+      "description_limit": 500
     },
     "polls": {
       "max_options": 6,