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/*
Copyright (c) 2019 Ben Morrison (gbmor)
This file is part of Getwtxt.
Getwtxt is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Getwtxt is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Getwtxt. If not, see <https://www.gnu.org/licenses/>.
*/
package svc // import "git.sr.ht/~gbmor/getwtxt/svc"
import (
"crypto/sha256"
"fmt"
"log"
"net/http"
"strconv"
"strings"
"sync"
"git.sr.ht/~gbmor/getwtxt/registry"
"github.com/gorilla/mux"
)
// Wrapper to check if an error is non-nil, then
// log the error if applicable.
func apiErrCheck(err error, r *http.Request) {
if err != nil {
uip := getIPFromCtx(r.Context())
log.Printf("*** %v :: %v %v :: %v\n", uip, r.Method, r.URL, err.Error())
}
}
// Deduplicates a slice of strings
func dedupe(list []string) []string {
out := []string{}
seen := make(map[string]bool)
for _, e := range list {
if !seen[e] {
out = append(out, e)
seen[e] = true
}
}
return out
}
// Takes the output of queries and formats it for
// an HTTP response. Iterates over the string slice,
// appending each entry to a byte slice, and adding
// newlines where appropriate.
func parseQueryOut(out []string) []byte {
data := make([]byte, 0)
for i, e := range out {
data = append(data, []byte(e)...)
if !strings.HasSuffix(e, "\n") && i != len(out)-1 {
data = append(data, byte('\n'))
}
}
return data
}
// apiEndpointQuery is called via apiEndpointHandler when
// the endpoint is "users" and r.FormValue("q") is not empty.
// It queries the registry cache for users or user URLs
// matching the term supplied via r.FormValue("q")
func apiEndpointQuery(w http.ResponseWriter, r *http.Request) error {
query := r.FormValue("q")
urls := r.FormValue("url")
pageVal := r.FormValue("page")
var out []string
var err error
pageVal = strings.TrimSpace(pageVal)
page, err := strconv.Atoi(pageVal)
errLog("", err)
vars := mux.Vars(r)
endpoint := vars["endpoint"]
// Handle user URL queries first, then nickname queries.
// Concatenate both outputs if they're both set.
// Also handle mention queries and status queries.
// If we made it this far and 'default' is matched,
// something went very wrong.
switch endpoint {
case "users":
var out2 []string
if query != "" {
out, err = twtxtCache.QueryUser(query)
apiErrCheck(err, r)
}
if urls != "" {
out2, err = twtxtCache.QueryUser(urls)
apiErrCheck(err, r)
}
if query != "" && urls != "" {
out = joinQueryOuts(out2)
}
case "mentions":
if urls == "" {
return fmt.Errorf("missing URL in mention query")
}
urls += ">"
out, err = twtxtCache.QueryInStatus(urls)
apiErrCheck(err, r)
case "tweets":
out = compositeStatusQuery(query, r)
default:
return fmt.Errorf("endpoint query, no cases match")
}
out = registry.ReduceToPage(page, out)
data := parseQueryOut(out)
etag := fmt.Sprintf("%x", sha256.Sum256(data))
w.Header().Set("ETag", etag)
w.Header().Set("Content-Type", txtutf8)
_, err = w.Write(data)
return err
}
// For composite queries, join the various slices of strings
// into a single slice of strings, then deduplicates them.
func joinQueryOuts(data ...[]string) []string {
single := []string{}
for _, e := range data {
single = append(single, e...)
}
return dedupe(single)
}
// Performs a composite query against the statuses.
func compositeStatusQuery(query string, r *http.Request) []string {
var wg sync.WaitGroup
var out, out2, out3 []string
var err, err2, err3 error
wg.Add(3)
query = strings.ToLower(query)
go func(query string) {
out, err = twtxtCache.QueryInStatus(query)
wg.Done()
}(query)
query = strings.Title(query)
go func(query string) {
out2, err2 = twtxtCache.QueryInStatus(query)
wg.Done()
}(query)
query = strings.ToUpper(query)
go func(query string) {
out3, err3 = twtxtCache.QueryInStatus(query)
wg.Done()
}(query)
wg.Wait()
apiErrCheck(err, r)
apiErrCheck(err2, r)
apiErrCheck(err3, r)
return joinQueryOuts(out, out2, out3)
}
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