Hugging Face inference API for image generation

public/scripts/extensions/stable-diffusion/index.js

@@ -52,6 +52,7 @@ const sources = {
     pollinations: 'pollinations',
     stability: 'stability',
     blockentropy: 'blockentropy',
+    huggingface: 'huggingface',
 };
 
 const initiators = {
@@ -454,6 +455,7 @@ async function loadSettings() {
     $('#sd_command_visible').prop('checked', extension_settings.sd.command_visible);
     $('#sd_interactive_visible').prop('checked', extension_settings.sd.interactive_visible);
     $('#sd_stability_style_preset').val(extension_settings.sd.stability_style_preset);
+    $('#sd_huggingface_model_id').val(extension_settings.sd.huggingface_model_id);
 
     for (const style of extension_settings.sd.styles) {
         const option = document.createElement('option');
@@ -1091,6 +1093,11 @@ function onComfyUrlInput() {
     saveSettingsDebounced();
 }
 
+function onHFModelInput() {
+    extension_settings.sd.huggingface_model_id = $('#sd_huggingface_model_id').val();
+    saveSettingsDebounced();
+}
+
 function onComfyWorkflowChange() {
     extension_settings.sd.comfy_workflow = $('#sd_comfy_workflow').find(':selected').val();
     saveSettingsDebounced();
@@ -2596,6 +2603,9 @@ async function sendGenerationRequest(generationType, prompt, additionalNegativeP
             case sources.blockentropy:
                 result = await generateBlockEntropyImage(prefixedPrompt, negativePrompt, signal);
                 break;
+            case sources.huggingface:
+                result = await generateHuggingFaceImage(prefixedPrompt, signal);
+                break;
         }
 
         if (!result.data) {
@@ -3229,6 +3239,34 @@ async function generateComfyImage(prompt, negativePrompt, signal) {
     return { format: 'png', data: await promptResult.text() };
 }
 
+
+/**
+ * Generates an image in Hugging Face Inference API using the provided prompt and configuration settings (model selected).
+ * @param {string} prompt - The main instruction used to guide the image generation.
+ * @param {AbortSignal} signal - An AbortSignal object that can be used to cancel the request.
+ * @returns {Promise<{format: string, data: string}>} - A promise that resolves when the image generation and processing are complete.
+ */
+async function generateHuggingFaceImage(prompt, signal) {
+    const result = await fetch('/api/sd/huggingface/generate', {
+        method: 'POST',
+        headers: getRequestHeaders(),
+        signal: signal,
+        body: JSON.stringify({
+            model: extension_settings.sd.huggingface_model_id,
+            prompt: prompt,
+        }),
+    });
+
+    if (result.ok) {
+        const data = await result.json();
+        return { format: 'jpg', data: data.image };
+    } else {
+        const text = await result.text();
+        throw new Error(text);
+    }
+}
+
+
 async function onComfyOpenWorkflowEditorClick() {
     let workflow = await (await fetch('/api/sd/comfy/workflow', {
         method: 'POST',
@@ -3508,6 +3546,8 @@ function isValidState() {
             return secret_state[SECRET_KEYS.STABILITY];
         case sources.blockentropy:
             return secret_state[SECRET_KEYS.BLOCKENTROPY];
+        case sources.huggingface:
+            return true;
     }
 }
 
@@ -3848,6 +3888,7 @@ jQuery(async () => {
     $('#sd_swap_dimensions').on('click', onSwapDimensionsClick);
     $('#sd_stability_key').on('click', onStabilityKeyClick);
     $('#sd_stability_style_preset').on('change', onStabilityStylePresetChange);
+    $('#sd_huggingface_model_id').on('input', onHFModelInput);
 
     $('.sd_settings .inline-drawer-toggle').on('click', function () {
         initScrollHeight($('#sd_prompt_prefix'));

public/scripts/extensions/stable-diffusion/settings.html

@@ -49,6 +49,7 @@
                 <option value="auto">Stable Diffusion Web UI (AUTOMATIC1111)</option>
                 <option value="horde">Stable Horde</option>
                 <option value="togetherai">TogetherAI</option>
+                <option value="huggingface">HuggingFace (Image Inference Endpoint)</option>
             </select>
             <div data-sd-source="auto">
                 <label for="sd_auto_url">SD Web UI URL</label>
@@ -82,6 +83,11 @@
                 <!-- (Original Text)<b>Important:</b> run DrawThings app with HTTP API switch enabled in the UI! The server must be accessible from the SillyTavern host machine. -->
                 <i><b data-i18n="Important:">Important:</b></i><i data-i18n="sd_drawthings_auth_txt"> run DrawThings app with HTTP API switch enabled in the UI! The server must be accessible from the SillyTavern host machine.</i>
             </div>
+            <div data-sd-source="huggingface">
+                <i>Hint: Save an API key in the Hugging Face API settings to use it here.</i>
+                <label for="sd_huggingface_model_id" data-i18n="Model ID">Model ID</label>
+                <input id="sd_huggingface_model_id" type="text" class="text_pole"  data-i18n="[placeholder]black-forest-labs/FLUX.1-dev" placeholder="black-forest-labs/FLUX.1-dev" value="" />
+            </div>
             <div data-sd-source="vlad">
                 <label for="sd_vlad_url">SD.Next API URL</label>
                 <div class="flex-container flexnowrap">

src/endpoints/stable-diffusion.js

@@ -991,11 +991,52 @@ blockentropy.post('/generate', jsonParser, async (request, response) => {
 });
 
 
+const huggingface = express.Router();
+
+huggingface.post('/generate', jsonParser, async (request, response) => {
+    try {
+        const key = readSecret(request.user.directories, SECRET_KEYS.HUGGINGFACE);
+
+        if (!key) {
+            console.log('Hugging Face key not found.');
+            return response.sendStatus(400);
+        }
+
+        console.log('Hugging Face request:', request.body);
+
+        const result = await fetch(`https://api-inference.huggingface.co/models/${request.body.model}`, {
+            method: 'POST',
+            body: JSON.stringify({
+                inputs: request.body.prompt,
+            }),
+            headers: {
+                'Content-Type': 'application/json',
+                'Authorization': `Bearer ${key}`,
+            },
+        });
+
+        if (!result.ok) {
+            console.log('Hugging Face returned an error.');
+            return response.sendStatus(500);
+        }
+
+        const buffer = await result.buffer();
+        return response.send({
+            image: buffer.toString('base64'),
+        });
+    } catch (error) {
+        console.log(error);
+        return response.sendStatus(500);
+    }
+});
+
+
 router.use('/comfy', comfy);
 router.use('/together', together);
 router.use('/drawthings', drawthings);
 router.use('/pollinations', pollinations);
 router.use('/stability', stability);
 router.use('/blockentropy', blockentropy);
+router.use('/huggingface', huggingface);
 
 module.exports = { router };