# Phase 9: OSINT Infrastructure - Context

**Gathered:** 2026-04-05
**Status:** Ready for planning
**Mode:** Auto-generated

<domain>
## Phase Boundary

Foundation for all OSINT/recon work. Creates the `pkg/recon/` package with:
- `ReconSource` interface every source module implements
- Per-source `rate.Limiter` (golang.org/x/time/rate) — no central limiter
- Stealth mode: user-agent rotation, jitter delays
- robots.txt respect for web scrapers
- Parallel sweep orchestrator that fans out to all enabled sources
- Deduplication across sources before persisting

Phases 10-16 implement individual sources on top of this foundation. Phase 9 ships with a single `ReconSource` stub (e.g., `ExampleSource`) to prove the framework end-to-end.

</domain>

<decisions>
## Implementation Decisions

### ReconSource Interface
```go
type ReconSource interface {
    Name() string                          // "shodan", "github", etc.
    RateLimit() rate.Limit                 // per-source token bucket rate
    Burst() int                            // burst capacity
    RespectsRobots() bool                  // web scrapers: true; APIs: false
    Enabled(cfg Config) bool               // enabled via config/env
    Sweep(ctx context.Context, query string, out chan<- Finding) error
}
```

### Package Layout
```
pkg/recon/
  source.go           — ReconSource interface
  engine.go           — Engine with Register/Sweep, parallel fanout, dedup
  limiter.go          — per-source rate.Limiter wrapper + jitter
  stealth.go          — user-agent pool, randomized delays
  robots.go           — robots.txt cache + allowed() check
  dedup.go            — cross-source finding dedup (hash by key+source_url)
  example.go          — ExampleSource stub implementation for testing
  engine_test.go
  stealth_test.go
  robots_test.go
```

### Rate Limiting (RECON-INFRA-05)
- Each source constructs `rate.NewLimiter(r.RateLimit(), r.Burst())` at registration
- `Engine.Sweep` calls `limiter.Wait(ctx)` before each source request
- Default rates per source configurable via config file

### Stealth Mode (RECON-INFRA-06)
- User-Agent pool: 10 realistic browser UAs in stealth.go (Chrome/Firefox/Safari on Linux/macOS/Windows)
- Jitter: random delay between 100ms and 1s before each request
- Activated via `--stealth` flag on `keyhunter recon` command
- "source exhausted" log events when a source returns zero results or hits rate limit

### robots.txt (RECON-INFRA-07)
- `pkg/recon/robots.go`: simple parser, cached per-host for 1 hour
- Only consulted when `RespectsRobots()` returns true (web scrapers)
- `--respect-robots` flag default on, can be disabled with `--no-respect-robots`
- Check User-Agent: "keyhunter" against disallowed paths

### Parallel Sweep Orchestrator (RECON-INFRA-08)
- `Engine.SweepAll(ctx, query, cfg)` fans out to all enabled sources via ants pool
- Each source runs in its own goroutine, writes findings to shared chan
- Deduplication: SHA256(provider + masked_key + source_url) — drop duplicates
- Result aggregated and returned for persistence

### CLI Command
- `keyhunter recon full [--stealth] [--respect-robots] [--query=STRING]` — sweep all enabled sources
- `keyhunter recon list` — list registered sources
- Phase 9 ships with `ExampleSource` to demonstrate the pipeline; real sources come in later phases

### Dependencies
- `golang.org/x/time/rate` — already in go.mod
- `github.com/temoto/robotstxt` — for robots.txt parsing (small, well-maintained)
- No new deps beyond robotstxt

</decisions>

<code_context>
## Existing Code Insights

### Reusable Assets
- pkg/engine/engine.go — ants pool pattern to mirror
- pkg/engine/finding.go — Finding struct (can reuse or create recon-specific)
- pkg/storage/findings.go — persistence
- cmd/stubs.go — recon stub to replace with real tree

### Finding vs ReconFinding
- Decision: reuse existing `engine.Finding`, extend SourceType field with recon sources
- SourceType values: "file", "git", "stdin", "url", "clipboard" (Phase 4), now add "recon:shodan", "recon:github", "recon:example"

</code_context>

<specifics>
## Specific Ideas

- ExampleSource should generate fake findings from a hardcoded list to prove the pipeline
- Each source's `Name()` should match its YAML dork source name for easy cross-referencing
- Dedup should preserve the first-seen source and metadata
- Stealth UA pool: include rare-but-realistic UAs to avoid UA-fingerprint blocking

</specifics>

<deferred>
## Deferred Ideas

- Proxy/TOR support — can be added later via http.Transport config
- Source-specific retry with exponential backoff — source modules handle their own retries
- Distributed rate limiting across multiple keyhunter instances — out of scope
- Webhook notifications on source exhaustion — defer to Phase 17 (Telegram)

</deferred>
