Mediatypes support

README.md

@@ -121,6 +121,8 @@ Features in *italics* are in the master branch, but not in the latest release.
   - Disabled by default, enable in config
 - [x] Proxying
   - Schemes like Gopher or HTTP can be proxied through a Gemini server
+- [x] *Configure applications to open particular mediatypes*
+    - [ ] Allow piping/streaming content instead of downloading it first
 - [x] Client certificate support
   - [ ] Full client certificate UX within the client
     - Create transient and permanent certs within the client, per domain

config/config.go

@@ -38,10 +38,18 @@ var bkmkDir string
 var bkmkPath string
 
 var DownloadsDir string
+var TempDownloadsDir string
 
 // Command for opening HTTP(S) URLs in the browser, from "a-general.http" in config.
 var HTTPCommand []string
 
+type MediaHandler struct {
+	Cmd      []string
+	NoPrompt bool
+}
+
+var MediaHandlers = make(map[string]MediaHandler)
+
 func Init() error {
 
 	// *** Set paths ***
@@ -169,6 +177,36 @@ func Init() error {
 		DownloadsDir = dDir
 	}
 
+	// Setup temporary downloads dir
+	if viper.GetString("a-general.temp_downloads") == "" {
+		TempDownloadsDir = filepath.Join(os.TempDir(), "amfora_temp")
+
+		// Make sure it exists
+		err = os.MkdirAll(TempDownloadsDir, 0755)
+		if err != nil {
+			return fmt.Errorf("downloads path could not be created: %s", DownloadsDir)
+		}
+	} else {
+		// Validate path
+		dDir := viper.GetString("a-general.temp_downloads")
+		di, err := os.Stat(dDir)
+		if err == nil {
+			if !di.IsDir() {
+				return fmt.Errorf("temp downloads path specified is not a directory: %s", dDir)
+			}
+		} else if os.IsNotExist(err) {
+			// Try to create path
+			err = os.MkdirAll(dDir, 0755)
+			if err != nil {
+				return fmt.Errorf("temp downloads path could not be created: %s", dDir)
+			}
+		} else {
+			// Some other error
+			return fmt.Errorf("couldn't access temp downloads directory: %s", dDir)
+		}
+		TempDownloadsDir = dDir
+	}
+
 	// *** Setup vipers ***
 
 	TofuStore.SetConfigFile(tofuDBPath)
@@ -202,6 +240,7 @@ func Init() error {
 	viper.SetDefault("a-general.left_margin", 0.15)
 	viper.SetDefault("a-general.max_width", 100)
 	viper.SetDefault("a-general.downloads", "")
+	viper.SetDefault("a-general.temp_downloads", "")
 	viper.SetDefault("a-general.page_max_size", 2097152)
 	viper.SetDefault("a-general.page_max_time", 10)
 	viper.SetDefault("a-general.emoji_favicons", false)
@@ -249,5 +288,26 @@ func Init() error {
 		HTTPCommand = strings.Fields(viper.GetString("a-general.http"))
 	}
 
+	var rawMediaHandlers []struct {
+		Cmd      []string `mapstructure:"cmd"`
+		Types    []string `mapstructure:"types"`
+		NoPrompt bool     `mapstructure:"no_prompt"`
+	}
+	err = viper.UnmarshalKey("mediatype-handlers", &rawMediaHandlers)
+	if err != nil {
+		return fmt.Errorf("couldn't parse mediatype-handlers section in config: %w", err)
+	}
+	for _, rawMediaHandler := range rawMediaHandlers {
+		for _, typ := range rawMediaHandler.Types {
+			if _, ok := MediaHandlers[typ]; ok {
+				return fmt.Errorf(`Multiple mediatype-handlers defined for %v`, typ)
+			}
+			MediaHandlers[typ] = MediaHandler{
+				Cmd:      rawMediaHandler.Cmd,
+				NoPrompt: rawMediaHandler.NoPrompt,
+			}
+		}
+	}
+
 	return nil
 }

default-config.toml

@@ -109,6 +109,44 @@ shift_numbers = "!@#$%^&*()"
 other = 'off'
 
 
+# [[mediatype-handlers]]
+# Specify what applications will open certain filetypes.
+# By default your default application will be used to open the file when you select "Open".
+#
+# To open jpeg files with the feh command:
+#   [[mediatype-handlers]]
+#   cmd = ["feh"]
+#   types = ["image/jpeg"]
+#
+# Each command that you specify must come under its own [[mediatype-handlers]]. You may
+# specify as many [[mediatype-handlers]] as you want to setup multiple commands.
+#
+# If the subtype is omitted then the specified command will be used for the
+# entire type:
+#   [[mediatype-handlers]]
+#   command = ["vlc", "--flag"]
+#   types = ["audio", "video"]
+#
+# A catch-all handler can by specified with "*".
+# Note that there are already catch-all handlers in place for all OSes,
+# that open the file using your default application. This is only if you
+# want to override that.
+#   [[mediatype-handlers]]
+#   cmd = ["some-command"]
+#   types = [
+#           "application/pdf",
+#           "*",
+#   ]
+#
+# If you want to always open a type in its viewer without the download or open
+# prompt appearing, you can add no_prompt = true
+#
+#   [[mediatype-handlers]]
+#   cmd = ["feh"]
+#   types = ["image"]
+#   no_prompt = true
+
+
 [cache]
 # Options for page cache - which is only for text/gemini pages
 # Increase the cache size to speed up browsing at the expense of memory