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middleware.go
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middleware.go
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package main
import (
"context"
"errors"
"net/http"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/gomodule/redigo/redis"
"github.com/gorilla/securecookie"
"github.com/gorilla/sessions"
"github.com/jmoiron/sqlx"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"github.com/savaki/dynastore"
)
// AddContext middleware ------------------------------------------------------
type AddContext struct {
handler http.Handler
awssess *session.Session
db *sqlx.DB
sc *securecookie.SecureCookie
secrets map[string]string
}
type ContextKey string
func (ac *AddContext) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
reqHeader := r.Header
resHeader := w.Header()
// lets add request_id to this context and as a response header
// but also as a cookie with a short expiration so we can catch
// additional immediate requests with the same id
var rid string
ridCookie, err := r.Cookie("RID")
if err == nil {
rid = ridCookie.Value
}
if len(rid) == 0 {
rid = reqHeader.Get("X-Request-ID")
}
ctx = context.WithValue(ctx, ContextKey("request_id"), rid)
resHeader.Set("X-Request-ID", rid)
ridCookie = &http.Cookie{
Name: "RID",
Value: rid,
Path: "/",
Secure: true,
HttpOnly: true,
Expires: time.Now().Add(3 * time.Second),
}
http.SetCookie(w, ridCookie)
// get the logger from the context and update it with the request_id
logger := zerolog.Ctx(ctx)
logger.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Str("request_id", rid)
})
messages := make([]Message, 0)
// redis connection
redisPool := &redis.Pool{
MaxIdle: 10,
IdleTimeout: 240 * time.Second,
Dial: func() (redis.Conn, error) {
return redis.Dial("tcp", "localhost:6379")
},
}
defaultConfig := make(map[string]interface{})
defaultConfig["quote_refresh"] = 20
r = r.Clone(context.WithValue(r.Context(), ContextKey("awssess"), ac.awssess))
r = r.Clone(context.WithValue(r.Context(), ContextKey("db"), ac.db))
r = r.Clone(context.WithValue(r.Context(), ContextKey("sc"), ac.sc))
r = r.Clone(context.WithValue(r.Context(), ContextKey("redisPool"), redisPool))
r = r.Clone(context.WithValue(r.Context(), ContextKey("config"), defaultConfig))
r = r.Clone(context.WithValue(r.Context(), ContextKey("webdata"), make(map[string]interface{})))
r = r.Clone(context.WithValue(r.Context(), ContextKey("google_maps_api_key"), ac.secrets["google_maps_api_key"]))
r = r.Clone(context.WithValue(r.Context(), ContextKey("github_oauth_key"), ac.secrets["github_oauth_key"]))
r = r.Clone(context.WithValue(r.Context(), ContextKey("messages"), &messages))
r = r.Clone(context.WithValue(r.Context(), ContextKey("nonce"), RandStringMask(32)))
ac.handler.ServeHTTP(w, r)
}
func withAddContext(h http.Handler, awssess *session.Session, db *sqlx.DB, sc *securecookie.SecureCookie, secrets map[string]string) *AddContext {
return &AddContext{h, awssess, db, sc, secrets}
}
// AddHeaders middleware ------------------------------------------------------
type AddHeader struct {
handler http.Handler
}
func (ah *AddHeader) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
nonce := ctx.Value(ContextKey("nonce")).(string)
resHeader := w.Header()
csp := []string{
"default-src 'self'",
"connect-src 'self' accounts.google.com *.fontawesome.com *.google-analytics.com *.googleapis.com *.facebook.com",
"style-src 'self' fonts.googleapis.com accounts.google.com 'unsafe-inline'",
"script-src 'self' *.googletagmanager.com *.facebook.net apis.google.com *.googleapis.com accounts.google.com kit.fontawesome.com 'nonce-" + nonce + "'",
"img-src * data:", // 'self' data: *.googleusercontent.com *.twimg.com avatars.githubusercontent.com assets.bwbx.io im.mstar.com im.morningstar.com mma.prnewswire.com",
"font-src 'self' fonts.gstatic.com *.fontawesome.com",
"frame-src 'self' accounts.google.com *.facebook.com",
"report-uri /internal/cspviolations",
"report-to default",
}
resHeader.Set("Content-Security-Policy", strings.Join(csp, "; "))
reportTo := `{"group":"default","max-age":1800,"endpoints":[{"url":"https://stockwatch.graystorm.com/internal/cspviolations"}],"include_subdomains":true}`
resHeader.Set("Report-To", reportTo)
ah.handler.ServeHTTP(w, r)
}
func withAddHeader(h http.Handler) *AddHeader {
return &AddHeader{h}
}
// Logging middleware ---------------------------------------------------------
type Logger struct {
handler http.Handler
}
func (l *Logger) ServeHTTP(w http.ResponseWriter, r *http.Request) {
t := time.Now()
lg := log.With().Logger()
// set request's context with l.WithContext which returns a copy of the context with the log object associated
r = r.WithContext(lg.WithContext(r.Context()))
l.handler.ServeHTTP(w, r)
// we've been around the block, grab that logger back from the context to log with
logger := log.Ctx(r.Context())
// don't logs these, no reason to
if r.URL.String() != "/ping" && r.URL.String() != "/metrics" {
logger.Info().
Stringer("url", r.URL).
Int("status_code", 200).
Str("method", r.Method).
Int64("response_time", time.Since(t).Nanoseconds()).
Msg("")
}
}
func withLogging(h http.Handler) *Logger {
return &Logger{h}
}
// Session management middleware ----------------------------------------------
type Session struct {
store *dynastore.Store
handler http.Handler
}
func (s *Session) ServeHTTP(w http.ResponseWriter, r *http.Request) {
logger := log.Ctx(r.Context())
session, err := s.store.Get(r, "SID")
if err != nil {
logger.Fatal().Err(err).Msg("Failed to get/create session")
}
if session.IsNew {
state := RandStringMask(32)
session.Values["state"] = state
session.Values["recents"] = []string{}
session.Values["theme"] = "light"
err := session.Save(r, w)
if err != nil {
logger.Fatal().Err(err).Msg("Failed to save session")
}
}
r = r.Clone(context.WithValue(r.Context(), ContextKey("ddbs"), session))
defer session.Save(r, w)
s.handler.ServeHTTP(w, r)
}
func withSession(store *dynastore.Store, h http.Handler) *Session {
return &Session{store, h}
}
func getSession(r *http.Request) *sessions.Session {
logger := log.Ctx(r.Context())
session := r.Context().Value(ContextKey("ddbs")).(*sessions.Session)
if session == nil {
logger.Fatal().Err(errors.New("failed to get session from Context")).Msg("")
}
return session
}