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resolve.go
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resolve.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package libkb
import (
"fmt"
"sync"
keybase1 "github.com/keybase/client/go/protocol"
jsonw "github.com/keybase/go-jsonw"
)
//==================================================================
type ResolveResult struct {
uid keybase1.UID
body *jsonw.Wrapper
err error
kbUsername string
}
func (res *ResolveResult) GetUID() keybase1.UID {
return res.uid
}
func (res *ResolveResult) GetError() error {
return res.err
}
func ResolveUID(input string) (res ResolveResult) {
G.Log.Debug("+ Resolving username %s", input)
var au AssertionURL
if au, res.err = ParseAssertionURL(input, false); res.err != nil {
return
}
res = resolveUID(au)
return
}
func ResolveUIDValuePair(key, value string) (res ResolveResult) {
G.Log.Debug("+ Resolve username (%s,%s)", key, value)
var au AssertionURL
if au, res.err = ParseAssertionURLKeyValue(key, value, false); res.err != nil {
res = resolveUID(au)
}
G.Log.Debug("- Resolve username (%s,%s) -> %v", key, value, res.uid)
return
}
func resolveUID(au AssertionURL) ResolveResult {
// A standard keybase UID, so it's already resolved
if tmp := au.ToUID(); tmp.Exists() {
return ResolveResult{uid: tmp}
}
ck := au.CacheKey()
if G.ResolveCache == nil {
return ResolveResult{}
}
if p := G.ResolveCache.Get(ck); p != nil {
return *p
}
r := resolveUsername(au)
if r.err != nil {
// Don't add to the cache if the resolve failed.
return r
}
if !au.IsKeybase() {
// Don't add to the cache if it's a mutable identity.
return r
}
G.ResolveCache.Put(ck, r)
return r
}
func resolveUsername(au AssertionURL) (res ResolveResult) {
var key, val string
var ares *APIRes
var l int
if au.IsKeybase() {
res.kbUsername = au.GetValue()
}
if key, val, res.err = au.ToLookup(); res.err != nil {
return
}
ha := HTTPArgsFromKeyValuePair(key, S{val})
ha.Add("multi", I{1})
ares, res.err = G.API.Get(APIArg{
Endpoint: "user/lookup",
NeedSession: false,
Args: ha,
})
if res.err != nil {
return
}
var them *jsonw.Wrapper
if them, res.err = ares.Body.AtKey("them").ToArray(); res.err != nil {
return
}
if l, res.err = them.Len(); res.err != nil {
return
}
if l == 0 {
res.err = fmt.Errorf("No resolution found for %s", au)
} else if l > 1 {
res.err = fmt.Errorf("Identity '%s' is ambiguous", au)
} else {
res.body = them.AtIndex(0)
res.uid, res.err = GetUID(res.body.AtKey("id"))
}
return
}
type ResolveCache struct {
results map[string]ResolveResult
sync.RWMutex
}
func NewResolveCache() *ResolveCache {
return &ResolveCache{results: make(map[string]ResolveResult)}
}
// Get returns a ResolveResult, if present in the cache.
func (c *ResolveCache) Get(key string) *ResolveResult {
c.RLock()
res, found := c.results[key]
c.RUnlock()
if found {
return &res
}
return nil
}
// Put receives a copy of a ResolveResult, clears out the body
// to avoid caching data that can go stale, and stores the result.
func (c *ResolveCache) Put(key string, res ResolveResult) {
res.body = nil
c.Lock()
c.results[key] = res
c.Unlock()
}