@@ 1,661 @@
+ GNU AFFERO GENERAL PUBLIC LICENSE
+ Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The GNU Affero General Public License is a free, copyleft license for
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+ END OF TERMS AND CONDITIONS
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+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source. For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code. There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
@@ 1,11 @@
+(()=>{var m=(t={},...e)=>e.reduce((r,i)=>{let s=t[i];return s===void 0?r:s},()=>{}),g=(t=document)=>m(t,"webkitFullscreenElement","mozFullScreenElement","msFullscreenElement","fullscreenElement"),p=(t=document.body)=>m(t,"webkitRequestFullScreen","mozRequestFullScreen","msRequestFullscreen","requestFullscreen").call(t),y=(t=document)=>m(t,"webkitExitFullscreen","mozCancelFullScreen","msExitFullscreen","exitFullscreen").call(t),o=t=>g()!==null?y():p(t);o.state=g;o.enter=p;o.leave=y;var h=class extends HTMLElement{constructor(){super(),this.attachShadow({mode:"open"}),this.shadowRoot.appendChild(document.createElement("slot"))}connectedCallback(){this.isConnected&&this.firstElementChild&&this.addEventListener("click",()=>{o(this.firstElementChild)})}},d=class extends HTMLElement{constructor(){super();let e=document.createRange().createContextualFragment(`
+ <style>
+ :host {
+ display: block;
+ }
+ :host([hidden]) {
+ display: none;
+ }
+ </style>
+ <slot></slot>
+ `);this.attachShadow({mode:"open"}),this.shadowRoot.appendChild(e)}static get observedAttributes(){return["flash","ready"]}get flash(){return this.getAttribute("flash")}set flash(e){this.setAttribute("flash",e)}get ready(){return this.getAttribute("ready")}set ready(e){this.setAttribute("ready",e)}get timeout(){let e=this.hasAttribute("timeout")?this.getAttribute("timeout"):1500;return parseInt(e,10)}set timeout(e){Number.isNaN(e)||this.setAttribute("timeout",e)}attributeChangedCallback(e,r,i){switch(e){case"ready":{if(i!==null){let s=new Event("ready");this.replaceChildren(),this.dispatchEvent(s)}break}case"flash":{let s=setTimeout(()=>{clearTimeout(s),this.setAttribute("ready","")},this.timeout);this.replaceChildren(i),this.removeAttribute("ready");break}}}};function C(t="http://localhost",e="/io/"){let{origin:r}=location,{href:i=r}=document.querySelector('link[rel="canonical"]'),s=RegExp("test|local").test(r)?t:i,{pathname:c,href:l}=new URL(s),a=String(c+e)?.replace(/\/{2}/g,"/"),{href:v}=new URL(a,l);return v}customElements?.define("just-scream",h);customElements?.define("just-flash",d);var u=document.getElementById("figure"),n=document.querySelector("just-flash"),E=()=>{if(n.flash!==""){let e=new Date().toLocaleTimeString(void 0,{hour12:!1});n.style.fontFamily="monospace",n.flash=e;return}n.removeEventListener("ready",E)};n.addEventListener("ready",E);var f=new Date(9),w=C("http://localhost:8001"),b=new EventSource(w);b.addEventListener("message",({data:t})=>{let{clientHeight:e,firstElementChild:r,scrollHeight:i}=u,s=f.getTime(),c=Math.min(s,e);f.setTime(s+1);let l=document.createElement("span");l.setAttribute("style",`font-size: ${s}px; line-height: ${c}px`);let a=document.createTextNode(t);l.appendChild(a),r===null&&(n.flash=""),r&&i>e&&u.removeChild(r),u.appendChild(l)});b.addEventListener("error",()=>{n.style.fontFamily="inherit",n.flash="Sorry, trying to connect still"});self.addEventListener("load",()=>{"serviceWorker"in navigator&&navigator.serviceWorker.register("serviceworker.js").catch(t=>{console.log("serviceworker: register:",t.message)}),n.style.fontFamily="inherit",n.flash="Connecting..."});})();
@@ 1,306 @@
+// Long form tracks arab spring related tweets.
+package main
+
+import (
+ "bytes"
+ "encoding/json"
+ "flag"
+ "fmt"
+ "io"
+ "log"
+ "net/http"
+ "os"
+ "strings"
+ "time"
+)
+
+// ENDPOINT is the streaming resource to be fetching data from.
+const ENDPOINT = "https://api.twitter.com/2/tweets/search/stream"
+
+// PORT is the default port number. Use the `-p` flag to override.
+const PORT = "8001"
+
+// KEYWORDS is the list of search terms to be filtering against.
+var KEYWORDS = []string{
+ "beirut",
+ "palestine",
+ "tunisia",
+ "egypt",
+ "yemen",
+ "libya",
+ "syria",
+}
+
+// Data contains fields found across tweets and rules responses.
+type Data struct {
+ ID string `json:"id"`
+ Tag string `json:"tag"`
+ Text string `json:"text"`
+}
+
+// Error allows for parsing errors embedded in an otherwise successful response.
+type Error struct {
+ Message string `json:"message"`
+}
+
+// Meta contains extra fields for parsing rules responses.
+type Meta struct {
+ Count int `json:"result_count"`
+}
+
+// Implements the http Handler interface and keeps
+// track of active connections.
+type tracker struct {
+ Clients map[string]chan string
+ Delay time.Duration
+ Idle bool
+ Local bool
+ Suspend chan bool
+ Resume chan bool
+}
+
+func (t *tracker) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ // Need to manually flush the response writer for SSE to work.
+ f, ok := w.(http.Flusher)
+
+ if !ok {
+ http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+
+ return
+ }
+
+ if a := r.Header.Get("Accept"); a != "text/event-stream" {
+ http.Error(w, http.StatusText(http.StatusNotAcceptable), http.StatusNotAcceptable)
+
+ return
+ }
+
+ if o := r.Header.Get("Origin"); t.Local && strings.Contains(o, "localhost") {
+ w.Header().Set("Access-Control-Allow-Origin", o)
+ }
+
+ w.Header().Set("Cache-Control", "no-cache")
+ w.Header().Set("Connection", "keep-alive")
+ w.Header().Set("Content-Type", "text/event-stream")
+
+ c := make(chan string)
+
+ defer func() {
+ delete(t.Clients, r.RemoteAddr)
+ t.Suspend <- true
+ }()
+
+ t.Clients[r.RemoteAddr] = c
+ t.Resume <- true
+
+L:
+ for {
+ select {
+ case d := <-c:
+ fmt.Fprintf(w, "retry: 10000\ndata: %s\n\n", d)
+ f.Flush()
+ case <-r.Context().Done():
+ break L
+ }
+ }
+}
+
+// Stream tells the tracker to call ENDPOINT for collecting data.
+func (t *tracker) Stream() {
+ defer func() {
+ // Free up for calling again.
+ t.Idle = true
+ }()
+
+ // Set busy state.
+ t.Idle = false
+
+ // Attempt to contact the streaming resource.
+ res, err := fetch(http.MethodGet, ENDPOINT, nil)
+
+ if err != nil {
+ log.Printf("tracker: failed to connect / %v", err)
+
+ // Calculate back off delay, wait as much and try again.
+ if t.Delay == 0 {
+ t.Delay = 1 * time.Minute
+ } else {
+ t.Delay = 2 * t.Delay
+ }
+
+ time.Sleep(t.Delay)
+ t.Resume <- true
+
+ return
+ }
+
+ // Safe to reset since the request seems to have went through OK.
+ t.Delay = 0
+
+ defer res.Body.Close()
+ dec := json.NewDecoder(res.Body)
+
+M:
+ for {
+ var msg struct {
+ Data Data
+ Error Error `json:"error"`
+ }
+
+ err := dec.Decode(&msg)
+ if err != nil {
+ // Done streaming.
+ if err == io.EOF {
+ break
+ }
+
+ log.Fatalf("tracker: failed to parse / %v", err)
+ }
+
+ if msg.Error.Message != "" {
+ log.Printf("tracker: API error: %v", msg.Error.Message)
+
+ break
+ }
+
+ select {
+ case <-t.Suspend:
+ if len(t.Clients) == 0 {
+ break M
+ }
+ default:
+ for _, c := range t.Clients {
+ c <- msg.Data.Text
+ }
+ }
+ }
+}
+
+// Check password and filtering rules ahead of launching the tracker.
+func init() {
+ // Only proceed if a password is available.
+ if _, ok := os.LookupEnv("BEARER_TOKEN"); !ok {
+ log.Fatal("init: the BEARER_TOKEN environment variable is required")
+ }
+
+ tap := ENDPOINT + "/rules"
+ tag := "long form"
+
+ add := func() error {
+ val := strings.Join(KEYWORDS, " OR ")
+ add := fmt.Sprintf(`{ "add": [{ "value": "%v", "tag": "%v" }] }`, val, tag)
+
+ _, err := fetch(http.MethodPost, tap, []byte(add))
+
+ return err
+ }
+
+ // A failed GET request could mean there are no rules available.
+ res, err := fetch(http.MethodGet, tap, nil)
+
+ if err != nil {
+ log.Printf("init: failed reading rules, %v", err)
+
+ // Try posting search rules.
+ if err := add(); err != nil {
+ log.Printf("init: failed adding rules, %v", err)
+ }
+
+ return
+ }
+
+ // To be parsing the response onto.
+ var msg struct {
+ Data []Data
+ Meta Meta `json:"meta"`
+ }
+
+ defer res.Body.Close()
+
+ if err := json.NewDecoder(res.Body).Decode(&msg); err != nil {
+ log.Printf("init: failed parsing rules, %v", err)
+
+ return
+ }
+
+ if msg.Meta.Count == 0 {
+ if err := add(); err != nil {
+ log.Printf("init: failed adding rules, %v", err)
+ }
+ }
+
+ tagMissing := func() bool {
+ for i := range msg.Data {
+ if msg.Data[i].Tag == tag {
+ return false
+ }
+ }
+ return true
+ }()
+
+ if tagMissing {
+ log.Print("init: failed finding rules")
+ }
+}
+
+func main() {
+ var p string
+ var l bool
+ var k string
+
+ flag.StringVar(&p, "p", PORT, "Choose a port number")
+ flag.BoolVar(&l, "l", false, "Allow localhost requests")
+ flag.StringVar(&k, "k", "/io/", "Choose a mount path prefix")
+ flag.Parse()
+
+ t := &tracker{
+ Clients: make(map[string]chan string),
+ Delay: 0,
+ Idle: true,
+ Local: l,
+ Suspend: make(chan bool),
+ Resume: make(chan bool),
+ }
+
+ // Listen for calls to start streaming.
+ go func() {
+ for <-t.Resume {
+ if t.Idle {
+ go t.Stream()
+ }
+ }
+ }()
+
+ s := &http.Server{
+ Addr: "localhost:" + p,
+ Handler: http.StripPrefix(k, t),
+ }
+
+ log.Fatal(s.ListenAndServe())
+}
+
+// fetch helps make BEARER_TOKEN authorized ENDPOINT json queries.
+func fetch(verb string, hook string, b []byte) (*http.Response, error) {
+ req, err := http.NewRequest(verb, hook, bytes.NewReader(b))
+
+ if err != nil {
+ return nil, err
+ }
+
+ req.Header.Set("Authorization", os.ExpandEnv("Bearer ${BEARER_TOKEN}"))
+ req.Header.Set("Content-Type", "application/json")
+
+ res, err := http.DefaultClient.Do(req)
+
+ if err != nil {
+ return nil, err
+ }
+
+ // If not 200/1, it's code 400 and above.
+ if res.StatusCode == http.StatusOK || res.StatusCode == http.StatusCreated {
+ // Reading from the response is up to the caller.
+ return res, nil
+ }
+
+ return nil, fmt.Errorf("fetch: request failed / %v", res.StatusCode)
+}
