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middleware.go
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/
middleware.go
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package router
import (
"net/http"
"time"
"github.com/PossibleLlama/golang-helpers/logging"
"github.com/PossibleLlama/golang-helpers/strings"
)
const (
HEADER_AUTH = "Authorization"
JSON_ENCODING = "application/json; charset=utf-8"
)
// SetDefaultHeadersMiddleware Sets default headers
func SetDefaultHeadersMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", JSON_ENCODING)
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE")
w.Header().Set("Access-Control-Allow-Headers", HEADER_AUTH)
next.ServeHTTP(w, r)
})
}
// CheckTraceTokenMiddleware Checks for x-trace-token,
// and if it doesn't exist creates one
func CheckTraceTokenMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if len(r.Header.Get(logging.TraceToken)) < 6 {
token := strings.RandAlphabeticString(16)
r.Header.Set(logging.TraceToken, token)
w.Header().Set(logging.TraceToken, token)
} else {
w.Header().Set(logging.TraceToken, r.Header.Get(logging.TraceToken))
}
next.ServeHTTP(w, r)
})
}
// LoggingMiddleware Logs details related to a request
func LoggingMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
start := time.Now()
lw := logging.LoggingResponseWriter{
ResponseWriter: w,
ResponseMetadata: &logging.LoggingResponseMetadata{},
}
next.ServeHTTP(&lw, r)
logging.LogResponse(
w.Header().Get(logging.TraceToken),
r,
lw.ResponseMetadata,
time.Since(start)*time.Millisecond)
})
}