ripple-api/app/method.go
2016-10-02 22:30:52 +02:00

134 lines
3.3 KiB
Go

package app
import (
"crypto/md5"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"regexp"
"strings"
"git.zxq.co/ripple/rippleapi/common"
"github.com/gin-gonic/gin"
)
// Method wraps an API method to a HandlerFunc.
func Method(f func(md common.MethodData) common.CodeMessager, privilegesNeeded ...int) gin.HandlerFunc {
return func(c *gin.Context) {
initialCaretaker(c, f, privilegesNeeded...)
}
}
func initialCaretaker(c *gin.Context, f func(md common.MethodData) common.CodeMessager, privilegesNeeded ...int) {
rateLimiter()
var doggoTags []string
data, err := ioutil.ReadAll(c.Request.Body)
if err != nil {
c.Error(err)
}
token := ""
switch {
case c.Request.Header.Get("X-Ripple-Token") != "":
token = c.Request.Header.Get("X-Ripple-Token")
case c.Query("token") != "":
token = c.Query("token")
case c.Query("k") != "":
token = c.Query("k")
default:
token, _ = c.Cookie("rt")
}
c.Set("token", fmt.Sprintf("%x", md5.Sum([]byte(token))))
md := common.MethodData{
DB: db,
RequestData: data,
C: c,
Doggo: doggo,
}
if token != "" {
tokenReal, exists := GetTokenFull(token, db)
if exists {
md.User = tokenReal
doggoTags = append(doggoTags, "authorised")
}
}
var ip string
if requestIP, _, err := net.SplitHostPort(strings.TrimSpace(c.Request.RemoteAddr)); err != nil {
panic(err)
} else {
// if requestIP is not 127.0.0.1, means no reverse proxy is being used => direct request.
if requestIP != "127.0.0.1" {
ip = requestIP
}
}
// means we're using reverse-proxy, so X-Real-IP
if ip == "" {
ip = c.ClientIP()
}
// requests from hanayo should not be rate limited.
if !(c.Request.Header.Get("H-Key") == cf.HanayoKey && c.Request.UserAgent() == "hanayo") {
perUserRequestLimiter(md.ID(), c.ClientIP())
} else {
doggoTags = append(doggoTags, "hanayo")
}
doggo.Incr("requests.v1", doggoTags, 1)
missingPrivileges := 0
for _, privilege := range privilegesNeeded {
if uint64(md.User.TokenPrivileges)&uint64(privilege) == 0 {
missingPrivileges |= privilege
}
}
if missingPrivileges != 0 {
c.IndentedJSON(401, common.SimpleResponse(401, "You don't have the privilege(s): "+common.Privileges(missingPrivileges).String()+"."))
return
}
resp := f(md)
if md.HasQuery("pls200") {
c.Writer.WriteHeader(200)
} else {
c.Writer.WriteHeader(resp.GetCode())
}
if md.HasQuery("callback") {
c.Header("Content-Type", "application/javascript; charset=utf-8")
} else {
c.Header("Content-Type", "application/json; charset=utf-8")
}
mkjson(c, resp)
}
// Very restrictive, but this way it shouldn't completely fuck up.
var callbackJSONP = regexp.MustCompile(`^[a-zA-Z_\$][a-zA-Z0-9_\$]*$`)
// mkjson auto indents json, and wraps json into a jsonp callback if specified by the request.
// then writes to the gin.Context the data.
func mkjson(c *gin.Context, data interface{}) {
exported, err := json.MarshalIndent(data, "", "\t")
if err != nil {
c.Error(err)
exported = []byte(`{ "code": 500, "message": "something has gone really really really really really really wrong." }`)
}
cb := c.Query("callback")
willcb := cb != "" &&
len(cb) < 100 &&
callbackJSONP.MatchString(cb)
if willcb {
c.Writer.Write([]byte("/**/ typeof " + cb + " === 'function' && " + cb + "("))
}
c.Writer.Write(exported)
if willcb {
c.Writer.Write([]byte(");"))
}
}