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middlew.go
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middlew.go
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package main
import (
"fmt"
"net/http"
"os"
"strconv"
"strings"
b64 "encoding/base64"
auth "github.com/eensymachines-in/auth/v2"
ex "github.com/eensymachines-in/errx"
"github.com/gin-gonic/gin"
"github.com/go-redis/redis/v7"
log "github.com/sirupsen/logrus"
"gopkg.in/mgo.v2"
)
// CORS : this shall allow cross origin requests
// https://asanchez.dev/blog/cors-golang-options/
func CORS(c *gin.Context) {
// First, we add the headers with need to enable CORS
// Make sure to adjust these headers to your needs
c.Header("Access-Control-Allow-Origin", "*")
c.Header("Access-Control-Allow-Methods", "*")
c.Header("Access-Control-Allow-Headers", "*")
c.Header("Content-Type", "application/json")
// Second, we handle the OPTIONS problem
if c.Request.Method != "OPTIONS" {
c.Next()
} else {
// Everytime we receive an OPTIONS request,
// we just return an HTTP 200 Status Code
// Like this, Angular can now do the real
// request using any other method than OPTIONS
c.AbortWithStatus(http.StatusOK)
}
}
// readAuthHeader : knows how to parse header for authorization
func readAuthHeader(c *gin.Context, authfield string, hdrValRead func(string) error) error {
authHeader := c.GetHeader("Authorization")
if authHeader == "" {
return ex.NewErr(&ex.ErrInvalid{}, nil, "Authorization header is empty", "readAuthHeader/c.GetHeader()")
}
// Please see the " " after authfield, do not include from client code
parts := strings.Split(authHeader, " ") // Bearer or Basic depending on if its token or the credentials
if len(parts) != 2 {
return ex.NewErr(&ex.ErrInvalid{}, nil, "Invalid authorization header", "readAuthHeader/strings.Split()")
}
if parts[1] == "" {
return ex.NewErr(&ex.ErrInvalid{}, nil, "No authorization token found", "readAuthHeader/strings.Split()")
}
return hdrValRead(parts[1]) // this function is customizable by the middle ware function
// Incase of token parse this is a simple TokenStr conversion
// while when its credentials - user:passwd after base64 decoding
}
// b64UserCredsParse :here we parse in user credentials from the request
// Incase the email or password is empty this will respond with 401 and not the expected 400
// 401 makes more sense when we are authenticating it but 400 makes more sense when we are patching the password
func b64UserCredsParse() gin.HandlerFunc {
return func(c *gin.Context) {
// ++++++++++++++++++
// Capturing the user account credentials encoded b64 format from
var email, passwd string
err := readAuthHeader(c, "Basic", func(val string) error {
v, err := b64.StdEncoding.DecodeString(val)
if err != nil {
return ex.NewErr(&ex.ErrInvalid{}, err, "Error reading the encrypted credentials", "b64UserCredsParse/readAuthHeader")
}
lump := strings.Split(string(v), ":")
email = lump[0]
passwd = lump[1]
return nil
})
if ex.DigestErr(err, c) != 0 {
return
}
if email == "" || passwd == "" {
// ++++++++++ incase the readAuthHeader read out empty creds
ex.DigestErr(ex.NewErr(&ex.ErrLogin{}, err, "Invalid credentials in the request authorization", "b64UserCredsParse/readAuthHeader"), c)
return
}
// ++++++++++++ user email and password are all set and ready to go
c.Set("email", email)
c.Set("passwd", passwd)
log.Infof("Email %s Passwd %s", email, passwd)
}
}
// tokenParse : from the request this will parse the tokens
func tokenParse() gin.HandlerFunc {
return func(c *gin.Context) {
// ++++++++++++++++++
// capturing the string token from the authorization header
var ts auth.TokenStr
err := readAuthHeader(c, "Bearer", func(val string) error {
ts = auth.TokenStr(val)
return nil
})
if ex.DigestErr(err, c) != 0 {
return
}
// ++++++++++++++++++
// now converting into token object, and checking for level
var tok *auth.JWTok
if c.Query("refresh") == "true" {
// only if its refresh action then we use the relevant secret
// here we dont care about elevation since all what we are here to do is get new tokens
tok, err = ts.Parse(os.Getenv("REFR_SECRET"))
if ex.DigestErr(err, c) != 0 {
return
}
} else {
tok, err = ts.Parse(os.Getenv("AUTH_SECRET"))
if ex.DigestErr(err, c) != 0 {
return
}
// here since we are authorizing we check for role level too..
// if the url does not specify the query param at all, the level check is avoided completely
if c.Query("lvl") != "" {
level, err := strconv.Atoi(c.Query("lvl"))
if err != nil {
c.AbortWithStatus(http.StatusBadRequest)
return
}
if !tok.HasElevation(level) {
ex.DigestErr(ex.NewErr(&ex.ErrInsuffPrivlg{}, fmt.Errorf("Role of the user does not have sufficient elevation"), "Insufficient privileges to perform this action", "tokenParse/HasElevation"), c)
return
}
}
}
c.Set("token", tok)
}
}
// verifyUser : this shall follow the tokenParse and then checks to see if the user in the token is same as the one in the param
// this is vital when it comes to modification of user accouts, only the user himself should be allowed to change details
func verifyUser() gin.HandlerFunc {
return func(c *gin.Context) {
val, exists := c.Get("token")
if !exists || val == nil {
ex.DigestErr(ex.NewErr(&ex.ErrInsuffPrivlg{}, fmt.Errorf("No authorization token found on the request that mandates it"), "This request needs authorization. Login again", "verifyUser/exists"), c)
return
}
tok := val.(*auth.JWTok)
if !(tok.User == c.Param("email")) {
ex.DigestErr(ex.NewErr(&ex.ErrLogin{}, fmt.Errorf("Token owner mismatches request param"), "There seems to be an issue with your authorization. You are advised to logout and login again", "verifyUser"), c)
return
}
}
}
// verifyRole : this shall follow the tokenParse and will check if the token has the minimum required elevation
func verifyRole(elevation int) gin.HandlerFunc {
return func(c *gin.Context) {
val, exists := c.Get("token")
if !exists || val == nil {
ex.DigestErr(ex.NewErr(&ex.ErrInsuffPrivlg{}, fmt.Errorf("No authorization token found on the request that mandates it"), "This request needs authorization. Login again using admin role", "verifyRole/exists"), c)
return
}
tok := val.(*auth.JWTok)
if !tok.HasElevation(elevation) {
ex.DigestErr(ex.NewErr(&ex.ErrInsuffPrivlg{}, fmt.Errorf("Role of the user does not have sufficient elevation"), "Insufficient privileges to perform this action", "verifyRole/HasElevation"), c)
return
}
}
}
// Middleware to connect to redis cache
func lclCacConnect() gin.HandlerFunc {
return func(c *gin.Context) {
tkCac := &auth.TokenCache{Client: redis.NewClient(&redis.Options{
Addr: "srvredis:6379",
Password: "", // no password set
DB: 0, // use default DB
})}
err := tkCac.Ping()
if err != nil {
ex.DigestErr(ex.NewErr(&ex.ErrConnFailed{}, err, "Server failed to connect to one of its services. Hang in till one of our admins fixes it", "lclCacConnect"), c)
}
c.Set("cache", tkCac)
c.Set("cache_close", func() {
tkCac.Close()
})
}
}
// this one adds database collections to the context
func lclDbConnect() gin.HandlerFunc {
return func(c *gin.Context) {
ip := "srvmongo"
session, err := mgo.Dial(ip)
if err != nil {
return
}
closeSession := func() {
session.Close()
}
// connecting to collections and pushing it in the context
// Incase the gateway fails and the database connection is not established we have to abort
coll := session.DB("autolumin").C("devreg")
if coll == nil {
ex.DigestErr(ex.NewErr(&ex.ErrConnFailed{}, fmt.Errorf("Failed to connect to autolumin database"), "Server failed to connect to one of its services. Hang in till one of our admins fixes it", "lclDbConnect:autolumin/devreg"), c)
// log.Error("Failed to get collection - 'devreg'")
// c.AbortWithError(http.StatusGatewayTimeout, fmt.Errorf("Failed db connection"))
return
}
c.Set("devreg", &auth.DeviceRegColl{Collection: coll})
coll = session.DB("autolumin").C("devblacklist")
if coll == nil {
ex.DigestErr(ex.NewErr(&ex.ErrConnFailed{}, fmt.Errorf("Failed to connect to autolumin database"), "Server failed to connect to one of its services. Hang in till one of our admins fixes it", "lclDbConnect:autolumin/devblacklist"), c)
// log.Error("Failed to get collection - 'devblacklist'")
// c.AbortWithError(http.StatusBadGateway, fmt.Errorf("Failed database collection connection"))
return
}
c.Set("devblacklist", &auth.BlacklistColl{Collection: coll})
// User account registration acocunt
coll = session.DB("autolumin").C("userreg")
if coll == nil {
ex.DigestErr(ex.NewErr(&ex.ErrConnFailed{}, fmt.Errorf("Failed to connect to autolumin database"), "Server failed to connect to one of its services. Hang in till one of our admins fixes it", "lclDbConnect:autolumin/userreg"), c)
return
}
c.Set("userreg", &auth.UserAccounts{Collection: coll})
// session close callback
c.Set("close_session", closeSession)
return
}
}