feat: add DeepL plugin

plugins/deepl/credentials.ts

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+export type DeepLCredentials = {
+  DEEPL_API_KEY?: string;
+};

plugins/deepl/icon.tsx

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+
+export function DeepLIcon({ className }: { className?: string }) {
+  return (
+    <svg
+      aria-label="DeepL logo"
+      className={className}
+      fill="currentColor"
+      viewBox="0 0 24 24"
+      xmlns="http://www.w3.org/2000/svg"
+    >
+      <title>DeepL</title>
+      <path d="M20.907 4.93953 12.68543.18573a1.3577 1.3577 0 0 0-1.3709 0L3.09298 4.9565a1.3766 1.3766 0 0 0-.68639 1.18233v9.52646a1.3766 1.3766 0 0 0 .68639 1.19363l8.22157 4.75946.06223.03583 4.04856 2.3458-.01131-2.06106.0075-1.1446.0038.01885v-.38467c0-.23006.1188-.43371.29605-.56005l.264-.15086.12633-.06977h-.0075l4.80283-2.7795a1.3803 1.3803 0 0 0 .68639-1.19551V6.13505a1.3803 1.3803 0 0 0-.68642-1.19552m-9.85269 9.68863a1.4275 1.4275 0 0 1-.39976 1.3841 1.4086 1.4086 0 0 1-1.97054 0 1.4199 1.4199 0 0 1 0-2.06294 1.4086 1.4086 0 0 1 2.0422.07543l3.32822-1.91585.6864.38656zm5.77019-2.41367a1.4086 1.4086 0 0 1-1.97054 0 1.4256 1.4256 0 0 1-.3696-1.47837l-.0132.0075-3.7525-2.1723-.05657.05656a1.4086 1.4086 0 0 1-1.97053 0 1.4199 1.4199 0 0 1 0-2.06293 1.4086 1.4086 0 0 1 1.97242 0c.3941.37713.52422.91832.39033 1.40672l3.7808 2.20059.01886-.01886a1.4086 1.4086 0 0 1 1.97242 0 1.42746 1.42746 0 0 1 0 2.06105z"/>
+    </svg>
+  );
+}

plugins/deepl/index.ts

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+import type { IntegrationPlugin } from "../registry";
+import { registerIntegration } from "../registry";
+import { DeepLIcon } from "./icon";
+
+const deepLPlugin: IntegrationPlugin = {
+  type: "deepl",
+  label: "DeepL",
+  description: "Translate text with DeepL",
+
+  icon: DeepLIcon,
+
+  formFields: [
+    {
+      id: "apiKey",
+      label: "API Key",
+      type: "password",
+      placeholder: "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx:fx",
+      configKey: "apiKey",
+      envVar: "DEEPL_API_KEY",
+      helpText: "Get your API key from ",
+      helpLink: {
+        text: "DeepL Account",
+        url: "https://www.deepl.com/account/summary",
+      },
+    },
+  ],
+
+  testConfig: {
+    getTestFunction: async () => {
+      const { testDeepL } = await import("./test");
+      return testDeepL;
+    },
+  },
+
+  actions: [
+    {
+      slug: "translate-text",
+      label: "Translate Text",
+      description: "Translate text from one language to another",
+      category: "DeepL",
+      stepFunction: "translateTextStep",
+      stepImportPath: "translate-text",
+      outputFields: [
+        { field: "translatedText", description: "The translated text" },
+        { field: "detectedSourceLang", description: "Detected source language code" },
+      ],
+      configFields: [
+        {
+          key: "text",
+          label: "Text to Translate",
+          type: "template-textarea",
+          placeholder: "Enter text or use {{NodeName.field}}",
+          example: "Hello, how are you?",
+          rows: 4,
+          required: true,
+        },
+        {
+          key: "targetLang",
+          label: "Target Language",
+          type: "select",
+          options: [
+            { value: "EN-US", label: "English (US)" },
+            { value: "EN-GB", label: "English (UK)" },
+            { value: "DE", label: "German" },
+            { value: "FR", label: "French" },
+            { value: "ES", label: "Spanish" },
+            { value: "IT", label: "Italian" },
+            { value: "PT-PT", label: "Portuguese (Portugal)" },
+            { value: "PT-BR", label: "Portuguese (Brazil)" },
+            { value: "NL", label: "Dutch" },
+            { value: "PL", label: "Polish" },
+            { value: "RU", label: "Russian" },
+            { value: "JA", label: "Japanese" },
+            { value: "ZH-HANS", label: "Chinese (Simplified)" },
+            { value: "ZH-HANT", label: "Chinese (Traditional)" },
+            { value: "KO", label: "Korean" },
+          ],
+          required: true,
+        },
+        {
+          key: "sourceLang",
+          label: "Source Language (optional)",
+          type: "select",
+          options: [
+            { value: "auto", label: "Auto-detect" },
+            { value: "EN", label: "English" },
+            { value: "DE", label: "German" },
+            { value: "FR", label: "French" },
+            { value: "ES", label: "Spanish" },
+            { value: "IT", label: "Italian" },
+            { value: "PT", label: "Portuguese" },
+            { value: "NL", label: "Dutch" },
+            { value: "PL", label: "Polish" },
+            { value: "RU", label: "Russian" },
+            { value: "JA", label: "Japanese" },
+            { value: "ZH", label: "Chinese" },
+            { value: "KO", label: "Korean" },
+          ],
+          defaultValue: "auto",
+        },
+        {
+          key: "formality",
+          label: "Formality",
+          type: "select",
+          options: [
+            { value: "default", label: "Default" },
+            { value: "more", label: "More formal" },
+            { value: "less", label: "Less formal" },
+            { value: "prefer_more", label: "Prefer more formal" },
+            { value: "prefer_less", label: "Prefer less formal" },
+          ],
+          defaultValue: "default",
+        },
+        {
+          key: "modelType",
+          label: "Model Type",
+          type: "select",
+          options: [
+            { value: "default", label: "Default" },
+            { value: "quality_optimized", label: "Better quality" },
+            { value: "latency_optimized", label: "Faster translation" },
+            { value: "prefer_quality_optimized", label: "Quality over speed" },
+          ],
+          defaultValue: "default",
+        },
+      ],
+    },
+  ],
+};
+
+registerIntegration(deepLPlugin);
+
+export default deepLPlugin;

plugins/deepl/steps/translate-text.ts

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+import "server-only";
+
+import { fetchCredentials } from "@/lib/credential-fetcher";
+import { type StepInput, withStepLogging } from "@/lib/steps/step-handler";
+import { getErrorMessage } from "@/lib/utils";
+import type { DeepLCredentials } from "../credentials";
+
+function getBaseUrl(apiKey: string): string {
+  // Free API keys end with ":fx"
+  return apiKey.endsWith(":fx")
+    ? "https://api-free.deepl.com"
+    : "https://api.deepl.com";
+}
+
+type DeepLTranslation = {
+  text: string;
+  detected_source_language: string;
+};
+
+type DeepLResponse = {
+  translations: DeepLTranslation[];
+};
+
+type TranslateTextResult =
+  | {
+      success: true;
+      translatedText: string;
+      detectedSourceLang: string;
+    }
+  | { success: false; error: string };
+
+export type TranslateTextCoreInput = {
+  text: string;
+  targetLang: string;
+  sourceLang?: string;
+  formality?: string;
+  modelType?: string;
+};
+
+export type TranslateTextInput = StepInput &
+  TranslateTextCoreInput & {
+    integrationId?: string;
+  };
+
+async function stepHandler(
+  input: TranslateTextCoreInput,
+  credentials: DeepLCredentials
+): Promise<TranslateTextResult> {
+  const apiKey = credentials.DEEPL_API_KEY;
+
+  if (!apiKey) {
+    return {
+      success: false,
+      error:
+        "DEEPL_API_KEY is not configured. Please add it in Project Integrations.",
+    };
+  }
+
+  if (!input.text) {
+    return {
+      success: false,
+      error: "Text to translate is required",
+    };
+  }
+
+  if (!input.targetLang) {
+    return {
+      success: false,
+      error: "Target language is required",
+    };
+  }
+
+  try {
+    const baseUrl = getBaseUrl(apiKey);
+
+    const body: Record<string, unknown> = {
+      text: [input.text],
+      target_lang: input.targetLang,
+    };
+
+    if (input.sourceLang && input.sourceLang !== "auto") {
+      body.source_lang = input.sourceLang;
+    }
+
+    if (input.formality && input.formality !== "default") {
+      body.formality = input.formality;
+    }
+
+    if (input.modelType && input.modelType !== "default") {
+      body.model_type = input.modelType;
+    }
+
+    const response = await fetch(`${baseUrl}/v2/translate`, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+        Authorization: `DeepL-Auth-Key ${apiKey}`,
+      },
+      body: JSON.stringify(body),
+    });
+
+    if (!response.ok) {
+      const errorData = (await response.json().catch(() => ({}))) as {
+        message?: string;
+      };
+      return {
+        success: false,
+        error: errorData.message || `HTTP ${response.status}`,
+      };
+    }
+
+    const result = (await response.json()) as DeepLResponse;
+
+    if (!result.translations || result.translations.length === 0) {
+      return {
+        success: false,
+        error: "No translation returned from DeepL",
+      };
+    }
+
+    const translation = result.translations[0];
+
+    return {
+      success: true,
+      translatedText: translation.text,
+      detectedSourceLang: translation.detected_source_language,
+    };
+  } catch (error) {
+    return {
+      success: false,
+      error: `Failed to translate: ${getErrorMessage(error)}`,
+    };
+  }
+}
+
+export async function translateTextStep(
+  input: TranslateTextInput
+): Promise<TranslateTextResult> {
+  "use step";
+
+  const credentials = input.integrationId
+    ? await fetchCredentials(input.integrationId)
+    : {};
+
+  return withStepLogging(input, () => stepHandler(input, credentials));
+}
+translateTextStep.maxRetries = 0;
+
+export const _integrationType = "deepl";

plugins/deepl/test.ts

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+function getBaseUrl(apiKey: string): string {
+  // Free API keys end with ":fx"
+  return apiKey.endsWith(":fx")
+    ? "https://api-free.deepl.com"
+    : "https://api.deepl.com";
+}
+
+export async function testDeepL(credentials: Record<string, string>) {
+  try {
+    const apiKey = credentials.DEEPL_API_KEY;
+
+    if (!apiKey) {
+      return {
+        success: false,
+        error: "DEEPL_API_KEY is required",
+      };
+    }
+
+    const baseUrl = getBaseUrl(apiKey);
+
+    // Use the usage endpoint to validate the API key
+    const response = await fetch(`${baseUrl}/v2/usage`, {
+      method: "GET",
+      headers: {
+        Authorization: `DeepL-Auth-Key ${apiKey}`,
+      },
+    });
+
+    if (!response.ok) {
+      if (response.status === 401 || response.status === 403) {
+        return {
+          success: false,
+          error: "Invalid API key. Please check your DeepL API key.",
+        };
+      }
+      return {
+        success: false,
+        error: `API validation failed: HTTP ${response.status}`,
+      };
+    }
+
+    return { success: true };
+  } catch (error) {
+    return {
+      success: false,
+      error: error instanceof Error ? error.message : String(error),
+    };
+  }
+}