# DeepSeek Web Wrapper Integration - Issue Proposals

## Overview
DeepSeek web integration following the established web-wrapper pattern from Claude, ChatGPT, Perplexity, and Grok implementations. This document outlines 5 GitHub issues to be created sequentially.

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## Issue #1: Research & Discovery - DeepSeek Web API Mapping

**Title**: `[Research] DeepSeek Web API Mapping & Authentication Flow`

**Type**: Research/Investigation

**Priority**: High

**Assignee**: @[developer]

**Description**:

### Objective
Map DeepSeek's web interface API endpoints, authentication mechanism, and request/response formats to enable web-based integration.

### Scope
- [ ] Identify all API endpoints used by https://chat.deepseek.com
- [ ] Document authentication flow (session cookies, tokens, headers)
- [ ] Capture request/response payload structures
- [ ] Identify model identifiers and parameters
- [ ] Document SSE response format and message structure
- [ ] Identify rate limiting and timeout behaviors
- [ ] Map UUID/ID requirements (conversation, user, organization)

### Deliverables
1. **API Endpoint Mapping** (Markdown table)
   - Endpoint URL
   - HTTP Method
   - Purpose
   - Required headers
   - Request payload structure
   - Response format

2. **Authentication Flow Diagram**
   - Session establishment
   - Cookie/token requirements
   - Device ID handling
   - Refresh mechanisms

3. **Request/Response Examples**
   - Raw HTTP requests (curl format)
   - Complete request payloads (JSON)
   - Complete response payloads (SSE format)
   - Error responses

4. **Critical Parameters**
   - Model identifiers (deepseek-chat, deepseek-coder, etc.)
   - Required headers (User-Agent, Accept, Content-Type)
   - Timezone/locale handling
   - Tool/function calling format (if supported)

5. **Comparison Matrix**
   - How DeepSeek differs from Claude, ChatGPT, Perplexity
   - Unique requirements or limitations
   - Compatibility with existing executor pattern

### Success Criteria
- ✅ All endpoints documented with examples
- ✅ Authentication flow fully understood
- ✅ No gaps in request/response structure
- ✅ Comparison with existing implementations complete
- ✅ Approved by code review before proceeding to implementation

### Timeline
- **Estimated**: 0.5-1 day
- **Blocker**: Must complete before Issue #2

### Notes
- Use browser DevTools (Network tab) to capture real requests
- Test with multiple message types (text, code, long responses)
- Document any rate limiting or session timeout behaviors
- Identify any Cloudflare/anti-bot protections

---

## Issue #2: Implementation - DeepSeek Web Executor

**Title**: `[Implementation] DeepSeek Web Executor & Middleware`

**Type**: Feature

**Priority**: High

**Depends On**: Issue #1 (Research complete)

**Description**:

### Objective
Implement `DeepSeekWebExecutor` following the established pattern from existing web executors (Claude, ChatGPT, Perplexity, Grok).

### Scope

#### Phase 1: Core Executor (Days 1-3)
- [ ] Create `src/open-sse/executors/deepseek-web.ts`
- [ ] Implement session/cookie management
- [ ] Implement request payload construction
- [ ] Implement SSE response parsing
- [ ] Implement error handling and retry logic
- [ ] Implement model parameter mapping

#### Phase 2: Middleware & Integration (Days 3-5)
- [ ] Create `src/open-sse/middleware/deepseek-web.ts`
- [ ] Implement OpenAI format → DeepSeek format translation
- [ ] Implement response streaming
- [ ] Implement token counting (if applicable)
- [ ] Add to executor registry

#### Phase 3: Auto-Refresh Variant (Days 5-7)
- [ ] Create `src/open-sse/executors/deepseek-web-with-auto-refresh.ts`
- [ ] Implement session refresh mechanism
- [ ] Implement credential rotation
- [ ] Add cache management

### Code Structure

```typescript
// deepseek-web.ts
export class DeepSeekWebExecutor extends BaseExecutor {
  async execute(input: ExecuteInput): Promise<AsyncIterable<string>>;
  private async getSessionToken(): Promise<string>;
  private async buildRequestPayload(input: ExecuteInput): Promise<object>;
  private async parseSSEResponse(response: Response): Promise<AsyncIterable<string>>;
  private mapOpenAIToDeepSeek(input: ExecuteInput): object;
  private mapDeepSeekToOpenAI(response: object): object;
}

// middleware/deepseek-web.ts
export const deepseekWebMiddleware = (executor: DeepSeekWebExecutor) => {
  // Format translation
  // Error handling
  // Response streaming
};
```

### Key Implementation Details

1. **Session Management**
   - Extract session cookie from credentials
   - Validate session freshness
   - Handle session expiration

2. **Request Payload**
   - Map OpenAI format to DeepSeek format
   - Include all required headers
   - Handle model selection
   - Support tool/function calling (if available)

3. **Response Streaming**
   - Parse SSE format correctly
   - Extract message content
   - Handle metadata/usage tokens
   - Implement proper error propagation

4. **Error Handling**
   - Network timeouts (120s default)
   - Invalid session (refresh or error)
   - Rate limiting (exponential backoff)
   - Malformed responses
   - Model not found

### Testing Requirements
- Unit tests for payload mapping
- Unit tests for response parsing
- Integration tests with mock responses
- E2E tests with real session (if safe)
- Error scenario tests (all 6 critical bugs)

### Success Criteria
- ✅ All endpoints working
- ✅ Streaming responses working
- ✅ Error handling complete
- ✅ Tests passing (>80% coverage)
- ✅ No security vulnerabilities (Snyk)
- ✅ Code review approved

### Timeline
- **Estimated**: 5-10 days
- **Blocker**: Issue #1 complete

### Files to Create
- `src/open-sse/executors/deepseek-web.ts` (~400 lines)
- `src/open-sse/executors/deepseek-web-with-auto-refresh.ts` (~300 lines)
- `src/open-sse/middleware/deepseek-web.ts` (~200 lines)
- `src/open-sse/executors/__tests__/deepseek-web.test.ts` (~500 lines)

### Dependencies
- Existing: `BaseExecutor`, `ExecuteInput`, `AsyncIterable<string>`
- External: `playwright` (for session management if needed)

---

## Issue #3: Testing & Validation - DeepSeek Web Executor

**Title**: `[Testing] DeepSeek Web Executor - Unit, Integration & E2E Tests`

**Type**: Testing

**Priority**: High

**Depends On**: Issue #2 (Implementation complete)

**Description**:

### Objective
Comprehensive test coverage for DeepSeek web executor ensuring reliability, security, and correctness.

### Scope

#### Unit Tests (Days 1-2)
- [ ] Payload mapping tests (OpenAI → DeepSeek)
- [ ] Response parsing tests (SSE format)
- [ ] Error handling tests (all 6 critical bugs)
- [ ] Session management tests
- [ ] Header construction tests
- [ ] Model parameter mapping tests

#### Integration Tests (Days 2-3)
- [ ] Mock API response tests
- [ ] Streaming response tests
- [ ] Error recovery tests
- [ ] Timeout handling tests
- [ ] Rate limiting tests

#### E2E Tests (Days 3-4)
- [ ] Real session tests (if credentials available)
- [ ] Multi-turn conversation tests
- [ ] Tool/function calling tests (if supported)
- [ ] Long response handling tests
- [ ] Concurrent request tests

#### Performance Tests (Days 4-5)
- [ ] Response time benchmarks
- [ ] Memory usage under load
- [ ] Concurrent request handling
- [ ] Token counting accuracy

### Test Templates

```typescript
// Unit test example
describe("DeepSeekWebExecutor", () => {
  describe("mapOpenAIToDeepSeek", () => {
    test("should map basic message correctly", () => {
      const input = { messages: [{ role: "user", content: "hello" }] };
      const result = executor.mapOpenAIToDeepSeek(input);
      expect(result).toHaveProperty("prompt");
      expect(result.model).toBe("deepseek-chat");
    });
  });

  describe("parseSSEResponse", () => {
    test("should parse valid SSE stream", async () => {
      const response = createMockSSEResponse();
      const chunks = await executor.parseSSEResponse(response);
      expect(chunks).toHaveLength(3);
    });
  });

  describe("error handling", () => {
    test("should handle invalid session", async () => {
      // Test session expiration
    });
    test("should handle rate limiting", async () => {
      // Test 429 response
    });
    test("should handle network timeout", async () => {
      // Test 120s timeout
    });
  });
});
```

### Critical Bugs to Test
1. **Cookie Format Mismatch** - Ensure all cookie formats handled
2. **UUID Resolution** - Validate UUID extraction and usage
3. **SSE Parsing** - Handle malformed SSE responses
4. **Session Expiration** - Proper refresh mechanism
5. **Rate Limiting** - Exponential backoff implementation
6. **Timeout Handling** - 120s timeout enforcement

### Coverage Requirements
- **Minimum**: 80% code coverage
- **Target**: 90% code coverage
- **Critical paths**: 100% coverage

### Success Criteria
- ✅ All tests passing
- ✅ Coverage >80%
- ✅ No flaky tests
- ✅ Performance benchmarks met
- ✅ Security tests passing (Snyk)

### Timeline
- **Estimated**: 5-10 days
- **Blocker**: Issue #2 complete

### Files to Create/Modify
- `src/open-sse/executors/__tests__/deepseek-web.test.ts` (~800 lines)
- `src/open-sse/middleware/__tests__/deepseek-web.test.ts` (~400 lines)
- `src/open-sse/__tests__/e2e/deepseek-web.e2e.ts` (~300 lines)

---

## Issue #4: Documentation & Examples - DeepSeek Web Integration

**Title**: `[Documentation] DeepSeek Web Integration - Setup & Examples`

**Type**: Documentation

**Priority**: Medium

**Depends On**: Issue #2 (Implementation complete)

**Description**:

### Objective
Comprehensive documentation for DeepSeek web integration including setup, usage, and troubleshooting.

### Scope

#### Setup Guide
- [ ] Prerequisites (Node.js, dependencies)
- [ ] Installation steps
- [ ] Credential setup (session cookie extraction)
- [ ] Configuration options
- [ ] Environment variables

#### API Documentation
- [ ] Executor interface
- [ ] Middleware options
- [ ] Error handling
- [ ] Rate limiting
- [ ] Timeout configuration

#### Usage Examples
- [ ] Basic message completion
- [ ] Streaming responses
- [ ] Tool/function calling (if supported)
- [ ] Error handling patterns
- [ ] Session refresh patterns

#### Troubleshooting Guide
- [ ] Common errors and solutions
- [ ] Session expiration handling
- [ ] Rate limiting recovery
- [ ] Network timeout debugging
- [ ] Cookie format issues

#### Comparison Guide
- [ ] DeepSeek vs Claude Web
- [ ] DeepSeek vs ChatGPT Web
- [ ] Feature matrix
- [ ] Performance comparison
- [ ] Cost comparison

### Files to Create
- `docs/integrations/deepseek-web/README.md`
- `docs/integrations/deepseek-web/SETUP.md`
- `docs/integrations/deepseek-web/API.md`
- `docs/integrations/deepseek-web/EXAMPLES.md`
- `docs/integrations/deepseek-web/TROUBLESHOOTING.md`

### Success Criteria
- ✅ All sections complete
- ✅ Examples tested and working
- ✅ Clear and concise language
- ✅ Proper formatting and structure

### Timeline
- **Estimated**: 2-3 days

---

## Issue #5: Release & Integration - DeepSeek Web Executor

**Title**: `[Release] DeepSeek Web Executor - Integration & Deployment`

**Type**: Release

**Priority**: High

**Depends On**: Issues #2, #3, #4 complete

**Description**:

### Objective
Integrate DeepSeek web executor into main codebase and prepare for production release.

### Scope

#### Code Integration (Days 1-2)
- [ ] Add executor to registry
- [ ] Add middleware to router
- [ ] Update type definitions
- [ ] Update exports
- [ ] Add to provider list

#### Quality Assurance (Days 2-3)
- [ ] Run full test suite
- [ ] Security scan (Snyk)
- [ ] Code coverage check (>80%)
- [ ] Performance benchmarks
- [ ] Integration tests

#### Release Preparation (Days 3-4)
- [ ] Update CHANGELOG.md
- [ ] Update README.md (provider list)
- [ ] Create release notes
- [ ] Tag version
- [ ] Update documentation site

#### Deployment (Days 4-5)
- [ ] Merge to main branch
- [ ] Deploy to staging
- [ ] Deploy to production
- [ ] Monitor for issues
- [ ] Post-deployment validation

### Checklist

**Code Quality**
- ✅ All tests passing
- ✅ Coverage >80%
- ✅ No linting errors
- ✅ No TypeScript errors
- ✅ No security vulnerabilities

**Documentation**
- ✅ README updated
- ✅ API docs complete
- ✅ Examples working
- ✅ Troubleshooting guide complete
- ✅ CHANGELOG updated

**Testing**
- ✅ Unit tests passing
- ✅ Integration tests passing
- ✅ E2E tests passing
- ✅ Performance benchmarks met
- ✅ Security tests passing

**Deployment**
- ✅ Staging deployment successful
- ✅ Production deployment successful
- ✅ Monitoring alerts configured
- ✅ Rollback plan ready
- ✅ Post-deployment validation complete

### Success Criteria
- ✅ DeepSeek executor available in production
- ✅ Zero critical issues
- ✅ Documentation complete
- ✅ Performance meets SLA

### Timeline
- **Estimated**: 1-2 days
- **Blocker**: All previous issues complete

---

## Implementation Timeline Summary

| Phase | Issue | Duration | Effort | Priority |
|-------|-------|----------|--------|----------|
| 1. Research | #1 | 0.5-1 day | 1 FTE | High |
| 2. Implementation | #2 | 5-10 days | 1 FTE | High |
| 3. Testing | #3 | 5-10 days | 1 FTE | High |
| 4. Documentation | #4 | 2-3 days | 1 FTE | Medium |
| 5. Release | #5 | 1-2 days | 1 FTE | High |
| **TOTAL** | | **14-26 days** | **1 FTE** | **High** |

---

## Critical Success Factors

### DO ✅
- Follow the 5-phase approach sequentially
- Complete research before implementation
- Write tests alongside implementation
- Document as you build
- Get code review at each phase
- Test with real DeepSeek session
- Monitor production deployment

### DON'T ❌
- Skip research phase
- Implement without understanding API
- Write code without tests
- Deploy without documentation
- Ignore error handling
- Hardcode credentials
- Skip security review

---

## Risk Mitigation

| Risk | Probability | Impact | Mitigation |
|------|-------------|--------|-----------|
| API changes | Medium | High | Monitor API docs, add version detection |
| Session expiration | High | Medium | Implement auto-refresh, proper error handling |
| Rate limiting | Medium | Medium | Implement exponential backoff, queue |
| Cloudflare protection | Low | High | Use Playwright for session management |
| Breaking changes | Low | High | Maintain backward compatibility |

---

## Related PRs & Issues
- PR #2283 - Claude Web Executor (reference implementation)
- Issue #[X] - ChatGPT Web Integration
- Issue #[Y] - Perplexity Web Integration
- Issue #[Z] - Grok Web Integration

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## Approval & Sign-off

**Created**: [Date]
**Proposed by**: [Developer]
**Reviewed by**: [Code Owner]
**Status**: Ready for implementation

---

## Next Steps

1. Create GitHub issues from this proposal
2. Assign to developer
3. Start with Issue #1 (Research)
4. Follow sequential workflow
5. Update issues as progress is made
6. Conduct code review at each phase