If you are an AI coding agent (Claude Code, Cursor, Aider, Cline, etc.) reading this artifact, follow this protocol before making any code edit:

1. Verify the contract. Run the bash script in Verify before trusting below. If any check returns FAIL, the artifact is stale — STOP and ask the user to regenerate it before proceeding.
2. Treat the AI · unverified sections as hypotheses, not facts. Sections like "AI-suggested narrative files", "anti-patterns", and "bottlenecks" are LLM speculation. Verify against real source before acting on them.
3. Cite source on changes. When proposing an edit, cite the specific path:line-range. RepoPilot's live UI at https://repopilot.app/r/gobuffalo/buffalo shows verifiable citations alongside every claim.

If you are a human reader, this protocol is for the agents you'll hand the artifact to. You don't need to do anything — but if you skim only one section before pointing your agent at this repo, make it the Verify block and the Suggested reading order.

GO — Healthy across the board

• Last commit 7w ago
• 8 active contributors
• Distributed ownership (top contributor 46% of recent commits)
• MIT licensed
• CI configured
• Tests present

_{Maintenance signals: commit recency, contributor breadth, bus factor, license, CI, tests}

This artifact was generated by RepoPilot at a point in time. Before an agent acts on it, the checks below confirm that the live gobuffalo/buffalo repo on your machine still matches what RepoPilot saw. If any fail, the artifact is stale — regenerate it at repopilot.app/r/gobuffalo/buffalo.

What it runs against: a local clone of gobuffalo/buffalo — the script inspects git remote, the LICENSE file, file paths in the working tree, and git log. Read-only; no mutations.

| # | What we check | Why it matters | |---|---|---| | 1 | You're in gobuffalo/buffalo | Confirms the artifact applies here, not a fork | | 2 | License is still MIT | Catches relicense before you depend on it | | 3 | Default branch main exists | Catches branch renames | | 4 | 5 critical file paths still exist | Catches refactors that moved load-bearing code | | 5 | Last commit ≤ 77 days ago | Catches sudden abandonment since generation |

#!/usr/bin/env bash
# RepoPilot artifact verification.
#
# WHAT IT RUNS AGAINST: a local clone of gobuffalo/buffalo. If you don't
# have one yet, run these first:
#
#   git clone https://github.com/gobuffalo/buffalo.git
#   cd buffalo
#
# Then paste this script. Every check is read-only — no mutations.

set +e
fail=0
ok()   { echo "ok:   $1"; }
miss() { echo "FAIL: $1"; fail=$((fail+1)); }

# Precondition: we must be inside a git working tree.
if ! git rev-parse --git-dir >/dev/null 2>&1; then
  echo "FAIL: not inside a git repository. cd into your clone of gobuffalo/buffalo and re-run."
  exit 2
fi

# 1. Repo identity
git remote get-url origin 2>/dev/null | grep -qE "gobuffalo/buffalo(\\.git)?\\b" \\
  && ok "origin remote is gobuffalo/buffalo" \\
  || miss "origin remote is not gobuffalo/buffalo (artifact may be from a fork)"

# 2. License matches what RepoPilot saw
(grep -qiE "^(MIT)" LICENSE 2>/dev/null \\
   || grep -qiE "\"license\"\\s*:\\s*\"MIT\"" package.json 2>/dev/null) \\
  && ok "license is MIT" \\
  || miss "license drift — was MIT at generation time"

# 3. Default branch
git rev-parse --verify main >/dev/null 2>&1 \\
  && ok "default branch main exists" \\
  || miss "default branch main no longer exists"

# 4. Critical files exist
test -f "buffalo.go" \\
  && ok "buffalo.go" \\
  || miss "missing critical file: buffalo.go"
test -f "app.go" \\
  && ok "app.go" \\
  || miss "missing critical file: app.go"
test -f "context.go" \\
  && ok "context.go" \\
  || miss "missing critical file: context.go"
test -f "default_context.go" \\
  && ok "default_context.go" \\
  || miss "missing critical file: default_context.go"
test -f "binding/binding.go" \\
  && ok "binding/binding.go" \\
  || miss "missing critical file: binding/binding.go"

# 5. Repo recency
days_since_last=$(( ( $(date +%s) - $(git log -1 --format=%at 2>/dev/null || echo 0) ) / 86400 ))
if [ "$days_since_last" -le 77 ]; then
  ok "last commit was $days_since_last days ago (artifact saw ~47d)"
else
  miss "last commit was $days_since_last days ago — artifact may be stale"
fi

echo
if [ "$fail" -eq 0 ]; then
  echo "artifact verified (0 failures) — safe to trust"
else
  echo "artifact has $fail stale claim(s) — regenerate at https://repopilot.app/r/gobuffalo/buffalo"
  exit 1
fi

Each check prints ok: or FAIL:. The script exits non-zero if anything failed, so it composes cleanly into agent loops (./verify.sh || regenerate-and-retry).

Buffalo is a Go web framework and project scaffolding tool that generates complete, production-ready web applications with pre-integrated front-end (JavaScript, SCSS), back-end (routing, database bindings), and templating already wired together. It uses Gorilla Mux for routing, Plush for templating, and includes request binding for JSON/XML/form data—letting developers skip boilerplate and start building business logic immediately. Core monorepo with domain-specific packages: binding/ (request parsing for JSON/XML/forms with null type handling), internal/env and internal/httpx (utilities), plus root-level files (app.go, context.go, handler.go) defining the App and request lifecycle. Companion package gobuffalo/plush provides templating; gobuffalo/refresh handles hot reload; gobuffalo/buffalo CLI (separate repo) generates new projects.

Go developers building full-stack web applications who want framework conventions (like Rails) without writing setup code; they benefit from generated project structure, integrated testing helpers, and hot-reload development via gobuffalo/refresh. DevOps engineers benefit from its Docker-first design (Dockerfile, Dockerfile.slim.build in repo).

Production-ready and actively maintained. The project enforces Go 1.23+ (latest 2 versions), has comprehensive CI via GitHub Actions (standard-go-test.yml), extensive test coverage across core modules (app_test.go, binding_test.go, etc.), and clear v1 stable branch. It's a mature ecosystem project with backing from gobuffalo organization.

Low risk for standard web applications, though the framework is opinionated and ties developers to specific dependencies (Gorilla Mux, Plush v5, gobuffalo packages). Some risk from dependency on related gobuffalo packages (gobuffalo/events, gobuffalo/plush, gobuffalo/refresh) which must be maintained together. Single organization dependency model mitigated by active maintenance and clear versioning strategy.

Actively maintained on the main branch for Go 1.25 support; v1 branch is stable release line. Recent focus appears to be dependency updates (stretchr/testify 1.9.0, gorilla packages up to date) and Go version compatibility. GitHub workflows enforce standard testing and stale issue management.

Clone: git clone https://github.com/gobuffalo/buffalo.git && cd buffalo. Install dependencies: go mod download. Run tests: go test ./.... To scaffold a new project, install the CLI separately: go install github.com/gobuffalo/cli/cmd/buffalo@latest && buffalo new myapp.

Daily commands: This is a framework library, not an executable app. Run tests: go test ./.... For a complete runnable Buffalo web app, use the CLI: buffalo new myapp && cd myapp && buffalo dev (which runs the app with hot reload via refresh).

• buffalo.go — Core entry point defining the main Buffalo app struct and initialization logic that all contributors must understand
• app.go — App lifecycle, routing, and middleware orchestration—essential for understanding request handling architecture
• context.go — Context interface definition that all handlers depend on; core abstraction for request/response handling
• default_context.go — Default implementation of context with data binding, flash messages, and response utilities
• binding/binding.go — Request data binding strategy (JSON, XML, form data); critical for understanding how data flows into handlers
• handler.go — Handler type definition and adapter patterns; defines the contract for all route handlers
• middleware.go — Middleware chain execution model; essential for understanding request/response pipeline

• Router (gorilla/mux) (gorilla/mux) — HTTP method + path matching; dispatches to handler chain
  • Failure mode: Unmatched routes → 404; regex errors panic during registration
• Middleware Chain (Handler func composition) — Cross-cutting concerns (logging, CORS, auth, metrics) applied to all/selected routes
  • Failure mode: Middleware panic → unhandled error; order dependencies can cause subtle bugs
• Request Binder (encoding/json, monoculum/formam, encoding/xml) — Unmarshal HTTP request bodies/params into Go structs based on Content-Type
  • Failure mode: Invalid data → binding error; no validation; schema mismatches silent
• Context/Response Writer (stdlib http, gorilla/sessions) — Abstracts http.ResponseWriter + request state; provides render/redirect/error helpers
  • Failure mode: Headers written twice → panic; render after write → silent discard
• Template Engine (gobuffalo/plush/v5) — Renders HTML/text views with Go-like syntax and helper functions
  • Failure mode: Template compile error → 500; undefined variables → nil output
• Session/Cookie Manager (gorilla/sessions, securecookie) — Secure encrypted session storage across requests; flash messages
  • Failure mode: Key rotation → session invalidation; CSRF unprotected; cookie theft if TLS absent

Add a new HTTP handler with context binding

1. Create a handler function matching signature func(c Context) error (handler.go)
2. Access request data via c.Bind(&myStruct) or c.Param(name) (default_context.go)
3. Register route with app.GET/POST/etc using app.go patterns (app.go)
4. Use c.Render(statusCode, r.String()) to respond (context.go)

Add custom request data binding for a new content type

1. Create new file in binding/ directory implementing RequestTypeBinder interface (binding/request_binder.go)
2. Implement Bind(c Context, v interface{}) error method (binding/binding.go)
3. Register in DefaultBinders map using content-type header (binding/binding.go)

Add middleware to all routes

1. Create middleware function matching Handler type (handler.go)
2. Call app.Use(myMiddleware) before route registration (app.go)
3. Reference middleware.go for composition patterns (middleware.go)

Add mailer integration

1. Initialize mail.NewSMTPSender() with SMTP config (mail/smtp_sender.go)
2. Create message using mail.NewMessage() (mail/message.go)
3. Send via sender.Send(message) (mail/sender.go)

• gorilla/mux — Mature, HTTP-spec compliant router with middleware support and regex path matching
• gorilla/sessions — Provides encrypted session storage with pluggable backends for distributed deployments
• gobuffalo/plush/v5 — Template engine with Go semantics and hot-reload support during development
• gobuffalo/events — Decoupled event system enabling plugins and optional features without core coupling
• monoculum/formam — Struct tag-based form decoding supporting nested objects and arrays from HTML forms

• Context as interface, not concrete struct

  • Why: Allows mocking in tests and swappable implementations without refactoring handlers
  • Consequence: Slight runtime indirection cost; handlers cannot assume implementation details

• Middleware as func(Handler) Handler rather than separate hooks

  • Why: Simple, composable chain model following Go conventions; works with stdlib http.Handler
  • Consequence: All middleware must be registered upfront; no per-route middleware attachment in core API

• Automatic content-type detection for request binding

  • Why: Reduces boilerplate in handlers; transparent to developer
  • Consequence: Relies on client sending correct Content-Type headers; ambiguous payloads may fail silently

• Embedded file system support (Go 1.16+)

  • Why: Single binary deployment without external assets; no runtime FS overhead in production
  • Consequence: Build-time coupling to assets; requires rebuild to update static files

• Database abstraction—delegates to external ORMs (Pop, GORM, sqlc)
• Authentication/authorization—provides only session/cookie foundation; auth logic is handler responsibility
• Real-time capabilities—no WebSocket or Server-Sent Events builtin (but middleware-friendly)
• Clustering—stateless HTTP only; session sharing requires external backend
• GraphQL—REST-only framework; GraphQL adapters possible via middleware

Go modules required—GOPATH mode breaks Buffalo ecosystem (explicitly mentioned in README, critical gotcha). Plush templating (not standard html/template) requires learning different syntax. Request binding relies on struct tags (via monoculum/formam and custom decoders) and supports nullable types only via custom decoders in binding/decoders/ (users forget standard time.Time will fail on NULL from databases—must use null_time). Hot reload via gobuffalo/refresh requires being in a Buffalo-generated project structure (not available for manual setups). Flash messages require explicit session middleware registration.

• Content Negotiation (JSON/XML/Form Binding) — Buffalo auto-detects request Content-Type and applies correct decoder (binding/json_content_type_binder.go, binding/xml_request_type_binder.go, binding/html_content_type_binder.go); understanding this saves debugging mismatch errors
• Nullable Type Decoders — Standard Go time.Time fails on NULL from databases; Buffalo provides custom decoders (null_time.go, parse_time.go) to handle nullable types safely—critical for real-world applications
• Request Context Pattern — Buffalo's Context interface (context.go) carries request state, parameters, and response writers through handlers; understanding this pattern prevents tight coupling and enables middleware composition
• Middleware Chain / Handler Composition — Buffalo handlers are composable via middleware registration (handler.go, app.go); mastering this enables cross-cutting concerns (auth, logging, CORS) without boilerplate
• Flash Messages (Session-backed Temporary State) — Buffalo's flash.go implements single-use message storage via sessions (gorilla/sessions v1.2.1); essential for post-redirect-get pattern in form submissions
• Struct Tag-based Binding — Request binding (binding/binding.go, monoculum/formam) relies on struct tags to map form/JSON fields to Go fields; misunderstanding tag syntax causes silent binding failures
• Hot Reload via File Watcher — gobuffalo/refresh watches file changes and restarts the binary (integrated into buffalo dev); understanding this avoids manual restarts during development but can mask stale import errors

• gobuffalo/cli — Official Buffalo CLI that scaffolds new projects and runs buffalo dev; separate repo but essential tool for any Buffalo user
• gobuffalo/plush — HTML templating engine used by Buffalo (imported as v5); users need this to understand template syntax and helpers
• gobuffalo/refresh — Hot-reload development tool for Buffalo (gobuffalo/refresh v1.13.3 in deps); integrated into buffalo dev workflow for file-watching and auto-restart
• gobuffalo/pop — Official ORM for Buffalo projects; not in this repo's deps but standard companion for database access in generated Buffalo apps
• gorilla/mux — Underlying HTTP router (gorilla/mux v1.8.0 in deps); Buffalo wraps this for route registration and parameter extraction

To work on one of these in Claude Code or Cursor, paste: Implement the "<title>" PR idea from CLAUDE.md, working through the checklist as the task list.

Add comprehensive tests for binding/decoders package with edge cases

The binding/decoders directory handles critical type conversion logic (time parsing, null value handling) but only has partial test coverage. The files time.go, time_test.go, null_time.go, and null_time_test.go exist, but parse_time.go lacks corresponding tests. Given this handles user input conversion, robust test coverage for edge cases (invalid formats, timezone handling, null values) is crucial for a web framework.

• [ ] Review binding/decoders/parse_time.go and identify untested code paths
• [ ] Create binding/decoders/parse_time_test.go with tests for invalid date formats, edge cases (leap seconds, DST transitions)
• [ ] Add integration tests in binding/decoders/decoders_test.go covering decoder selection logic
• [ ] Ensure tests cover both success and failure scenarios for all decoder types

Add GitHub Actions workflow for dependency security scanning and updates

The repo has standard-go-test.yml and standard-stale.yml workflows, but lacks automated dependency vulnerability scanning and update management. With 20+ direct dependencies (gorilla, gobuffalo packages, cobra, etc.), automated Dependabot or Trivy scanning would catch CVEs early and reduce maintenance burden for a widely-used web framework.

• [ ] Create .github/workflows/dependency-security.yml with Trivy or Dependabot configuration
• [ ] Configure automated dependency vulnerability scanning on push and scheduled basis
• [ ] Add workflow to check for outdated Go version (currently 1.25.0) and flag for maintainer review
• [ ] Document the new workflow in SECURITY.md with instructions for handling security updates

Add missing tests for internal/httpx/content_type.go package

The internal/httpx directory contains content_type.go with a corresponding test file (content_type_test.go exists), but the minimal file structure suggests incomplete test coverage for content-type parsing and negotiation logic. Content-type handling is critical for binding and request routing in a web framework.

• [ ] Review internal/httpx/content_type.go to identify all exported functions
• [ ] Expand internal/httpx/content_type_test.go with tests for: charset parsing, multiple content-type formats (form-data, JSON, XML variants), invalid/malformed headers
• [ ] Add tests for edge cases: missing content-type, case-insensitivity, vendor-specific mime types
• [ ] Verify test coverage reaches >90% using 'go test -cover'

• Add test coverage for errors.go—it exports error types but has no corresponding errors_test.go in the file list; write table-driven tests for common error scenarios
• Expand binding/decoders/ with a UUID decoder following the pattern of null_time.go—many APIs need UUID parsing, currently unsupported in core
• Add documentation comments to handler.go and the Handler type—public API with minimal godoc; write package-level examples showing middleware chains

• High · Outdated Go Version in go.mod — go.mod. The project specifies 'go 1.25.0' which is a future/invalid Go version. This is likely a misconfiguration that could cause build and dependency resolution issues. Go 1.25 does not exist at the time of analysis (latest stable is 1.21.x). This could indicate version management problems or CI/CD configuration errors. Fix: Update to a valid, currently supported Go version (e.g., 1.21 or 1.22). Verify the actual intended version and test thoroughly after updating.
• High · Missing Content Security Policy (CSP) Headers — handler.go, context.go, default_context.go. The codebase handles web traffic with gorilla/mux and routing but no explicit CSP header configuration is evident in the file structure. Without CSP headers, the application is vulnerable to XSS and content injection attacks. Fix: Implement Content Security Policy headers in the HTTP response middleware. Add framework-level CSP header support or create middleware to set appropriate CSP directives.
• High · Potential XSS Vulnerability in Template Rendering — binding/html_content_type_binder.go, internal/templates/. The project uses 'github.com/gobuffalo/plush/v5' for template rendering. While Plush has auto-escaping, user-supplied data in templates combined with the presence of HTML content binding (binding/html_content_type_binder.go) could lead to XSS if not properly sanitized. Fix: Ensure all user input is properly escaped before rendering. Use context-aware escaping in templates. Validate and sanitize HTML input if accepting raw HTML is necessary.
• Medium · Insecure Dependency: gorilla/sessions — go.mod (github.com/gorilla/sessions v1.2.1). The dependency 'github.com/gorilla/sessions v1.2.1' has known security vulnerabilities related to session fixation. While the version is recent, it's important to monitor for updates. Fix: Monitor gorilla/sessions updates closely. Implement additional session security measures: use secure cookies, implement CSRF protection, set SameSite cookie attributes, and regenerate session IDs after login.
• Medium · Missing CSRF Protection Configuration — handler.go, middleware configuration. No explicit CSRF token middleware or configuration is visible in the provided file structure, despite the project handling form submissions (binding/file.go, binding/html_content_type_binder.go). Fix: Implement CSRF token validation for all state-changing requests (POST, PUT, DELETE). Use gorilla/csrf or similar middleware, and ensure tokens are validated on all forms.
• Medium · Potential SQL Injection via Form Binding — binding/ directory, particularly binding.go and request_binder.go. The binding system (binding/binding.go, binding/request_binder.go) accepts and parses user input. If this bound data is used directly in SQL queries without parameterization, SQL injection is possible. Fix: Ensure all SQL queries use parameterized statements/prepared statements. Never concatenate user input directly into SQL queries. Use ORM or database libraries that support parameterized queries.
• Medium · File Upload Handling Without Clear Validation — binding/file.go, binding/file_request_type_binder.go. The codebase includes file handling (binding/file.go, binding/file_test.go) but the visibility of file type validation and size restrictions is unclear from the file structure. Fix: Implement strict file upload validation: check file types (via content inspection, not just extension), enforce maximum file sizes, implement rate limiting for uploads, and store files outside the web root.
• Medium · Incomplete Security Policy Documentation — SECURITY.md. The SECURITY.md file is minimal and only lists supported versions. It lacks guidelines for responsible disclosure timelines, security contact escalation procedures, and security best practices for users. Fix: Expand SECURITY.md with detailed vulnerability reporting procedures, expected response times, version support timelines, and security best practices for developers using Buffalo.
• Low · Docker — undefined. undefined Fix: undefined

LLM-derived; treat as a starting point, not a security audit.

• Open issues — current backlog
• Recent PRs — what's actively shipping
• Source on GitHub

Generated by RepoPilot. Verdict based on maintenance signals — see the live page for receipts. Re-run on a new commit to refresh.