commit 513b788d2790d064788907b54a793406e96e4bfe
Author: Thor Harald Johansen <thj@thj.no>
Date:   Sun Oct 18 13:53:31 2020 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d344ba6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+config.json
diff --git a/config.example.json b/config.example.json
new file mode 100644
index 0000000..d01ff06
--- /dev/null
+++ b/config.example.json
@@ -0,0 +1,6 @@
+{
+    "max_age": 48,
+    "instances": [
+        "mastodon.social"
+    ]
+}
diff --git a/fedidel.py b/fedidel.py
new file mode 100644
index 0000000..8dadf4e
--- /dev/null
+++ b/fedidel.py
@@ -0,0 +1,270 @@
+import os
+import time
+from datetime import datetime, timezone, timedelta
+import json
+import pprint
+import threading
+import traceback
+
+from mastodon import Mastodon, MastodonNotFoundError
+
+def log_print(source, text):
+    prefix = "{}: ".format(source)
+    text = (prefix + text.strip()).replace("\n", "\n" + prefix)
+    print(text)
+
+def log_pprint(source, obj):
+    log(source, pprint.pformat(obj))
+
+# Floor datetime to nearest hour
+#def floor_dt(dt):
+#    return dt - timedelta(
+#        minutes      = dt.minute,
+#        seconds      = dt.second,
+#        microseconds = dt.microsecond)
+
+def encode_time(dt):
+    return int(dt.strftime("%Y%m%d%H"))
+
+def decode_time(value):
+    return dt.strptime(str(value), "%Y%m%d%H")
+
+class Instance:
+    def __init__(self, name, config):
+        self.name = name
+        self.config = config
+        
+        self.base_url = "https://{}".format(name)
+        self.client_file = "secret/{}.client".format(name)
+        self.user_file = "secret/{}.user".format(name)
+        
+        self.state_file = "state/{}.state".format(name)
+        self.state_lock = threading.Lock()
+
+        self.spawner_thread = threading.Thread(
+            target = self.spawner,
+            name = self.name + " spawner",
+            args = (),
+            kwargs = {},
+            daemon = True)
+        
+        self.tracker_thread = threading.Thread(
+            target = self.tracker,
+            name = self.name + " tracker",
+            args = (),
+            kwargs = {},
+            daemon = True)
+
+        self.purger_thread = threading.Thread(
+            target = self.purger,
+            name = self.name + " purger",
+            args = (),
+            kwargs = {},
+            daemon = True)
+        
+    def setup(self):
+        if not os.path.exists(self.client_file):
+            Mastodon.create_app(
+                'MastodonDeleter',
+                api_base_url = self.base_url,
+                to_file = self.client_file)
+         
+        if not os.path.exists(self.user_file):
+            api = Mastodon(
+                api_base_url = self.base_url,
+                client_id = self.client_file)
+        
+            auth_url = api.auth_request_url()
+            
+            print("Go to:")
+            print(auth_url)
+            print()
+            
+            auth_code = input("Enter code: ")
+            
+            print()
+
+            api.log_in(code = auth_code, to_file = self.user_file)
+
+    def start(self):
+        self.spawner_thread.start()
+
+    def spawner(self):
+        self.load_state()
+
+        self.api = Mastodon(
+            access_token = self.user_file,
+            api_base_url = self.base_url)
+ 
+        self.tracker_thread.start()
+        self.purger_thread.start()
+
+        while True:
+            self.tracker_report()
+            time.sleep(60)
+
+    def tracker(self):
+        my_id = self.api.me()["id"]
+
+        while True:
+            try:
+                self.state_lock.acquire()
+                min_id = self.state["min_id"]
+                self.state_lock.release()
+                
+                statuses = self.api.account_statuses(my_id, min_id = min_id)
+
+                while not statuses is None and len(statuses) > 0:
+                    log_print(self.name, "Found {} new status(es)".format(len(statuses)))
+
+                    for status in sorted(statuses,
+                            key = lambda status: status["created_at"]):
+                        self.track_status(status)
+
+                    self.save_state()
+
+                    statuses = self.api.fetch_previous(statuses)
+
+                    # Rate limit (300 requests per 5 minutes, i.e. 1 per second)
+                    time.sleep(1)
+
+            except:
+                log_print(self.name, traceback.format_exc())
+
+            time.sleep(60)
+
+    def purger(self):
+        while True:
+            try:
+                
+                timeslot_key, status_id = self.next_expired()
+
+                if not timeslot_key is None:
+                    log_print(self.name, "Deleting status {} in timeslot {}".format(status_id, timeslot_key))
+                    
+                    try:
+                        self.api.status_delete(status_id)
+                    
+                    except MastodonNotFoundError:
+                        log_print(self.name,
+                            "Cannot delete missing status {} from server".format(status_id))
+
+                    self.expire_status(timeslot_key, status_id)
+                    time.sleep(60)
+                else:
+                    time.sleep(1)
+            except:
+                log_print(self.name, traceback.format_exc())
+                time.sleep(60)
+
+    def load_state(self):
+        self.state_lock.acquire()
+
+        if not os.path.exists(self.state_file):
+            self.state = dict(
+                min_id = "0",
+                timeslots = {})
+        else:
+            with open(self.state_file) as json_file:
+                self.state = json.load(json_file)
+
+            self.state["timeslots"] = dict(map(lambda kv: (int(kv[0]), set(kv[1])), self.state["timeslots"]))
+                
+        self.state_lock.release()
+
+    def save_state(self):
+        self.state_lock.acquire()
+
+        json_state = self.state.copy()
+        json_state["timeslots"] = list(map(lambda kv: [kv[0], list(kv[1])], json_state["timeslots"].items()))
+
+        self.state_lock.release()
+
+        with open(self.state_file, "w") as json_file:
+            json.dump(json_state, json_file, indent = 4)
+
+    def tracker_report(self):
+        self.state_lock.acquire()
+
+        total_timeslots = len(self.state["timeslots"])
+        total_statuses = 0
+        for timeslot_key, status_ids in self.state["timeslots"].items():
+           total_statuses += len(status_ids)
+
+        self.state_lock.release()
+
+        log_print(self.name, "Tracking {} statuses across {} timeslots".format(
+            total_statuses, total_timeslots))
+
+    def track_status(self, status):
+        status_id = str(status["id"])
+        timeslot_key = encode_time(status["created_at"])
+
+        self.state_lock.acquire()
+        if status["reblog"] is None:
+            timeslots = self.state["timeslots"]
+            if not timeslot_key in timeslots:
+                timeslots[timeslot_key] = set()
+            timeslots[timeslot_key].add(status_id)
+           
+        if status_id > self.state["min_id"]:
+            self.state["min_id"] = status_id
+
+        self.state_lock.release()
+    
+    def next_expired(self):
+        now = datetime.now(timezone.utc)
+        min_timeslot_key = encode_time(now - timedelta(hours = self.config["max_age"]))
+
+        self.state_lock.acquire()
+        
+        timeslot_key, status_ids = next(iter(self.state["timeslots"].items()), (None, None))
+
+        if not timeslot_key is None and timeslot_key < min_timeslot_key:
+            status_id = next(iter(status_ids), None)
+        else:
+            timeslot_key = None
+            status_id = None
+
+        
+        self.state_lock.release()
+ 
+        return (timeslot_key, status_id)
+
+    def expire_status(self, timeslot_key, status_id):
+        self.state_lock.acquire()
+
+        timeslots = self.state["timeslots"]
+        if timeslot_key in timeslots:
+            if status_id in timeslots[timeslot_key]:
+                log_print(self.name, "Expiring status {} from timeslot {}".format(status_id, timeslot_key))
+                timeslots[timeslot_key].remove(status_id)
+            else:
+                log_print(self.name, "Cannot expire missing status {} from timeslot {}".format(
+                    status_id, timeslot_key))
+
+            if len(timeslots[timeslot_key]) == 0:
+                log_print(self.name, "Removing empty timeslot {}".format(timeslot_key))
+                del timeslots[timeslot_key]
+        else:
+            log_print(self.name, "Cannot expire status {} from missing timeslot {}".format(
+                status_id, timeslot_key))
+
+        self.state_lock.release()
+        self.save_state()
+
+with open("config.json") as json_file:
+    config = json.load(json_file)
+
+instances = {}
+for name in config["instances"]:
+    instances[name] = Instance(name = name, config = config)
+    instances[name].setup()
+
+start_interval = 60.0 / len(config["instances"])
+for instance in instances.values():
+    instance.start()
+    time.sleep(start_interval)
+
+while True:
+    time.sleep(1)
diff --git a/fedidel.service b/fedidel.service
new file mode 100644
index 0000000..2455476
--- /dev/null
+++ b/fedidel.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=Fediverse YouTube Converter
+
+[Service]
+User=thor
+WorkingDirectory=/usr/local/lib/fedidel
+ExecStart=/usr/bin/python3 /usr/local/lib/fedidel/deleter.py
+Environment=PYTHONUNBUFFERED=1
+SyslogIdentifier=fedidel
+Restart=always
+
+[Install]
+WantedBy=multi-user.target
diff --git a/secret/.gitignore b/secret/.gitignore
new file mode 100644
index 0000000..d6b7ef3
--- /dev/null
+++ b/secret/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore
diff --git a/state/.gitignore b/state/.gitignore
new file mode 100644
index 0000000..d6b7ef3
--- /dev/null
+++ b/state/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore