Provider fix, anthropic Errorhandling if empty image file is read (anomalyco#5521)

Author: rwese

packages/opencode/src/provider/transform.ts

@@ -171,6 +171,20 @@ export namespace ProviderTransform {
       const filtered = msg.content.map((part) => {
         if (part.type !== "file" && part.type !== "image") return part
 
+        // Check for empty base64 image data
+        if (part.type === "image") {
+          const imageStr = part.image.toString()
+          if (imageStr.startsWith("data:")) {
+            const match = imageStr.match(/^data:([^;]+);base64,(.*)$/)
+            if (match && (!match[2] || match[2].length === 0)) {
+              return {
+                type: "text" as const,
+                text: "ERROR: Image file is empty or corrupted. Please provide a valid image.",
+              }
+            }
+          }
+        }
+
         const mime = part.type === "image" ? part.image.toString().split(";")[0].replace("data:", "") : part.mediaType
         const filename = part.type === "file" ? part.filename : undefined
         const modality = mimeToModality(mime)

packages/opencode/test/provider/transform.test.ts

@@ -262,3 +262,106 @@ describe("ProviderTransform.message - DeepSeek reasoning content", () => {
     expect(result[0].providerOptions?.openaiCompatible?.reasoning_content).toBeUndefined()
   })
 })
+
+describe("ProviderTransform.message - empty image handling", () => {
+  const mockModel = {
+    id: "anthropic/claude-3-5-sonnet",
+    providerID: "anthropic",
+    api: {
+      id: "claude-3-5-sonnet-20241022",
+      url: "https://api.anthropic.com",
+      npm: "@ai-sdk/anthropic",
+    },
+    name: "Claude 3.5 Sonnet",
+    capabilities: {
+      temperature: true,
+      reasoning: false,
+      attachment: true,
+      toolcall: true,
+      input: { text: true, audio: false, image: true, video: false, pdf: true },
+      output: { text: true, audio: false, image: false, video: false, pdf: false },
+      interleaved: false,
+    },
+    cost: {
+      input: 0.003,
+      output: 0.015,
+      cache: { read: 0.0003, write: 0.00375 },
+    },
+    limit: {
+      context: 200000,
+      output: 8192,
+    },
+    status: "active",
+    options: {},
+    headers: {},
+  } as any
+
+  test("should replace empty base64 image with error text", () => {
+    const msgs = [
+      {
+        role: "user",
+        content: [
+          { type: "text", text: "What is in this image?" },
+          { type: "image", image: "data:image/png;base64," },
+        ],
+      },
+    ] as any[]
+
+    const result = ProviderTransform.message(msgs, mockModel)
+
+    expect(result).toHaveLength(1)
+    expect(result[0].content).toHaveLength(2)
+    expect(result[0].content[0]).toEqual({ type: "text", text: "What is in this image?" })
+    expect(result[0].content[1]).toEqual({
+      type: "text",
+      text: "ERROR: Image file is empty or corrupted. Please provide a valid image.",
+    })
+  })
+
+  test("should keep valid base64 images unchanged", () => {
+    const validBase64 =
+      "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg=="
+    const msgs = [
+      {
+        role: "user",
+        content: [
+          { type: "text", text: "What is in this image?" },
+          { type: "image", image: `data:image/png;base64,${validBase64}` },
+        ],
+      },
+    ] as any[]
+
+    const result = ProviderTransform.message(msgs, mockModel)
+
+    expect(result).toHaveLength(1)
+    expect(result[0].content).toHaveLength(2)
+    expect(result[0].content[0]).toEqual({ type: "text", text: "What is in this image?" })
+    expect(result[0].content[1]).toEqual({ type: "image", image: `data:image/png;base64,${validBase64}` })
+  })
+
+  test("should handle mixed valid and empty images", () => {
+    const validBase64 =
+      "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg=="
+    const msgs = [
+      {
+        role: "user",
+        content: [
+          { type: "text", text: "Compare these images" },
+          { type: "image", image: `data:image/png;base64,${validBase64}` },
+          { type: "image", image: "data:image/jpeg;base64," },
+        ],
+      },
+    ] as any[]
+
+    const result = ProviderTransform.message(msgs, mockModel)
+
+    expect(result).toHaveLength(1)
+    expect(result[0].content).toHaveLength(3)
+    expect(result[0].content[0]).toEqual({ type: "text", text: "Compare these images" })
+    expect(result[0].content[1]).toEqual({ type: "image", image: `data:image/png;base64,${validBase64}` })
+    expect(result[0].content[2]).toEqual({
+      type: "text",
+      text: "ERROR: Image file is empty or corrupted. Please provide a valid image.",
+    })
+  })
+})