100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
package app
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import (
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"database/sql"
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"encoding/json"
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"io/ioutil"
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"github.com/gin-gonic/gin"
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"github.com/osuripple/api/common"
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)
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// Method wraps an API method to a HandlerFunc.
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func Method(f func(md common.MethodData) common.Response, db *sql.DB, privilegesNeeded ...int) gin.HandlerFunc {
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return func(c *gin.Context) {
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initialCaretaker(c, f, db, privilegesNeeded...)
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}
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}
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func initialCaretaker(c *gin.Context, f func(md common.MethodData) common.Response, db *sql.DB, privilegesNeeded ...int) {
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data, err := ioutil.ReadAll(c.Request.Body)
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if err != nil {
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c.Error(err)
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}
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c.Request.Body.Close()
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token := ""
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switch {
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case c.Request.Header.Get("X-Ripple-Token") != "":
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token = c.Request.Header.Get("X-Ripple-Token")
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case c.Query("token") != "":
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token = c.Query("token")
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case c.Query("k") != "":
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token = c.Query("k")
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}
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md := common.MethodData{
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DB: db,
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RequestData: data,
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C: c,
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}
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if token != "" {
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tokenReal, exists := GetTokenFull(token, db)
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if exists {
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md.User = tokenReal
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}
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}
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missingPrivileges := 0
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for _, privilege := range privilegesNeeded {
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if int(md.User.Privileges)&privilege == 0 {
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missingPrivileges |= privilege
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}
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}
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if missingPrivileges != 0 {
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c.IndentedJSON(401, common.Response{
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Code: 401,
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Message: "You don't have the privilege(s): " + common.Privileges(missingPrivileges).String() + ".",
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})
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return
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}
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resp := f(md)
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if resp.Code == 0 {
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resp.Code = 500
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}
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if _, exists := c.GetQuery("pls200"); exists {
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c.Writer.WriteHeader(200)
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} else {
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c.Writer.WriteHeader(resp.Code)
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}
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if _, exists := c.GetQuery("callback"); exists {
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c.Header("Content-Type", "application/javascript; charset=utf-8")
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} else {
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c.Header("Content-Type", "application/json; charset=utf-8")
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}
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mkjson(c, resp)
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}
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// mkjson auto indents json, and wraps json into a jsonp callback if specified by the request.
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// then writes to the gin.Context the data.
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func mkjson(c *gin.Context, data interface{}) {
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exported, err := json.MarshalIndent(data, "", "\t")
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if err != nil {
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c.Error(err)
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exported = []byte(`{ "code": 500, "message": "something has gone really really really really really really wrong.", "data": null }`)
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}
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cb := c.Query("callback")
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willcb := cb != "" && len(cb) < 100
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if willcb {
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c.Writer.Write([]byte("/**/ typeof " + cb + " === 'function' && " + cb + "("))
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}
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c.Writer.Write(exported)
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if willcb {
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c.Writer.Write([]byte(");"))
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}
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}
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