// Perms is a middleware function that attempts to cache the
// user's remote rempository permissions (ie in GitHub) to minimize
// remote calls that might be expensive, slow or rate-limited.
func Perms(c *gin.Context) {
var (
owner = c.Param("owner")
name = c.Param("name")
user, _ = c.Get("user")
)
if user == nil {
c.Next()
return
}
// if the item already exists in the cache
// we can continue the middleware chain and
// exit afterwards.
v := cache.GetPerms(c,
user.(*model.User),
owner,
name,
)
if v != nil {
c.Set("perm", v)
c.Next()
return
}
// otherwise, if the item isn't cached we execute
// the middleware chain and then cache the permissions
// after the request is processed.
c.Next()
perm, ok := c.Get("perm")
if ok {
cache.SetPerms(c,
user.(*model.User),
perm.(*model.Perm),
owner,
name,
)
}
}
func TestPermCache(t *testing.T) {
g := goblin.Goblin(t)
g.Describe("Perm Cache", func() {
var c *gin.Context
g.BeforeEach(func() {
c = new(gin.Context)
cache.ToContext(c, cache.Default())
})
g.It("should skip when no user session", func() {
c.Params = gin.Params{
gin.Param{Key: "owner", Value: "octocat"},
gin.Param{Key: "name", Value: "hello-world"},
}
Perms(c)
_, ok := c.Get("perm")
g.Assert(ok).IsFalse()
})
g.It("should get perms from cache", func() {
c.Params = gin.Params{
gin.Param{Key: "owner", Value: "octocat"},
gin.Param{Key: "name", Value: "hello-world"},
}
c.Set("user", fakeUser)
cache.SetPerms(c, fakeUser, fakePerm, "octocat", "hello-world")
Perms(c)
perm, ok := c.Get("perm")
g.Assert(ok).IsTrue()
g.Assert(perm).Equal(fakePerm)
})
})
}