Add fallback-content-type property

docs/configuration.md

@@ -1006,12 +1006,16 @@ Display a widget provided by an external source (3rd party). If you want to lear
 | Name | Type | Required | Default |
 | ---- | ---- | -------- | ------- |
 | url | string | yes | |
+| fallback-content-type | string | no | |
 | allow-potentially-dangerous-html | boolean | no | false |
 | parameters | key & value | no | |
 
 ##### `url`
 The URL of the extension.
 
+##### `fallback-content-type`
+Optionally specify the fallback content type of the extension if the URL does not return a valid `Widget-Content-Type` header. Currently the only supported value for this property is `html`.
+
 ##### `allow-potentially-dangerous-html`
 Whether to allow the extension to display HTML.
 

internal/feed/extension.go

@@ -27,9 +27,10 @@ const (
 )
 
 type ExtensionRequestOptions struct {
-	URL        string            `yaml:"url"`
-	Parameters map[string]string `yaml:"parameters"`
-	AllowHtml  bool              `yaml:"allow-potentially-dangerous-html"`
+	URL                 string            `yaml:"url"`
+	FallbackContentType string            `yaml:"fallback-content-type"`
+	Parameters          map[string]string `yaml:"parameters"`
+	AllowHtml           bool              `yaml:"allow-potentially-dangerous-html"`
 }
 
 type Extension struct {
@@ -88,7 +89,11 @@ func FetchExtension(options ExtensionRequestOptions) (Extension, error) {
 	contentType, ok := ExtensionStringToType[response.Header.Get(ExtensionHeaderContentType)]
 
 	if !ok {
-		contentType = ExtensionContentUnknown
+		contentType, ok = ExtensionStringToType[options.FallbackContentType]
+
+		if !ok {
+			contentType = ExtensionContentUnknown
+		}
 	}
 
 	extension.Content = convertExtensionContent(options, body, contentType)

internal/widget/extension.go

@@ -12,12 +12,13 @@ import (
 )
 
 type Extension struct {
-	widgetBase `yaml:",inline"`
-	URL        string            `yaml:"url"`
-	Parameters map[string]string `yaml:"parameters"`
-	AllowHtml  bool              `yaml:"allow-potentially-dangerous-html"`
-	Extension  feed.Extension    `yaml:"-"`
-	cachedHTML template.HTML     `yaml:"-"`
+	widgetBase          `yaml:",inline"`
+	URL                 string            `yaml:"url"`
+	FallbackContentType string            `yaml:"fallback-content-type"`
+	Parameters          map[string]string `yaml:"parameters"`
+	AllowHtml           bool              `yaml:"allow-potentially-dangerous-html"`
+	Extension           feed.Extension    `yaml:"-"`
+	cachedHTML          template.HTML     `yaml:"-"`
 }
 
 func (widget *Extension) Initialize() error {
@@ -38,9 +39,10 @@ func (widget *Extension) Initialize() error {
 
 func (widget *Extension) Update(ctx context.Context) {
 	extension, err := feed.FetchExtension(feed.ExtensionRequestOptions{
-		URL:        widget.URL,
-		Parameters: widget.Parameters,
-		AllowHtml:  widget.AllowHtml,
+		URL:                 widget.URL,
+		FallbackContentType: widget.FallbackContentType,
+		Parameters:          widget.Parameters,
+		AllowHtml:           widget.AllowHtml,
 	})
 
 	widget.canContinueUpdateAfterHandlingErr(err)