idm

Downloader with Internet Download Manager (Windows), with an HTTP agent server, a web interface and download completion tracking. Links can be sent to IDM from any OS.

• Features
• Installing
• Example
• Command line usage
• Agent server mode
  • Architecture
  • Quick start
  • Web interface
  • Download completion tracking
  • HTTP API
  • Job lifecycle
  • FAQ: what is the queue for?
  • Python API
  • Configuration
  • Security
  • Run at Windows startup
  • Troubleshooting
• Support
• Tips
• Links
• Author

Features

• Send links to IDM from Python or the command line (referrer, cookies, post data, credentials, user agent, save path, add-only).
• Agent server (idm --server): receive links over HTTP/JSON and forward them to IDM through COM.
• Agent client (idm -A): send links to an agent from Windows, Linux, macOS or anywhere Python 3.7+ runs.
• Web interface served by the agent at /: add links, watch every IDM download.
• Completion tracking: knows if a download is still running, complete, failed or cancelled (reads IDM's own log files). idm -w waits for it.
• Token authentication, same-origin/CSRF/DNS-rebinding protection, loopback-only by default.
• Standard library only for the server, client and web UI.

Installing

Install and update using pip:

pip install idm

Requires Python 3.7+. pip install idm detects the OS by itself, you never have to pick packages by hand:

flowchart TD
    A["pip install idm"] --> B{"Windows ?"}
    B -- yes --> C["envdot, make_colors, clipboard, ...<br/>+ comtypes + pywin32"]
    B -- no --> D["envdot, make_colors, clipboard, ...<br/>(comtypes / pywin32 skipped)"]
    C --> E["Full: idm --server, local IDM via COM,<br/>idm -A client"]
    D --> F["Agent client: idm -A http://HOST:8899 URL"]
    F -. "idm --server / local download" .-> G["Clear message:<br/>'Local IDM (COM) is only available on Windows'"]

On non-Windows systems import idm and idm -A ... work; idm --server and local downloads print a clear message and exit with code 1 instead of crashing. The Windows-only packages are declared with environment markers (sys_platform == "win32"), so idm[com], idm[win] and idm[all] are harmless on other systems too.

idm[agent] is portable-only metadata; plain pip install idm on Windows still adds the COM packages (that is the auto-detect). If a Windows machine must never get them (it only forwards links to another PC) use the separate idm-agent distribution (same package, built with PYIDM_AGENT_ONLY=1 python -m build). Install only one of idm / idm-agent.

Example

What does it look like? Here is an example of a simple pyidm program:

from idm import IDMan

downloader = IDMan()
url = "http://test.com/test.exe"

downloader.download(url, r"c:\DOWNLOADS", "test_output.exe")

and "Internet Download Manager (IDM)" will open then immediately download the URL

add link without start downloading

from idm import IDMan

downloader = IDMan()
url = "http://test.com/test.exe"

downloader.download(url, r"c:\DOWNLOADS", "test_output.exe", add_only=True)

download() returns True when IDM accepted the link, False otherwise (the reason is in downloader.last_error). IDMan() itself never fails; download() raises OSNotSupport (not Windows / comtypes missing) or IDMNotFound (IDM not installed).

or run on terminal/cmd

> idm "http://test.com/test.exe" -p C:\DOWNLOADS -o test_output.exe -c -ua "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36" -r "http://test.com/test.exe" -U admin -P admin123 -D "Authorization=Bearer KN9WW7k5gKgCnQLpnmWWM7LytAuSUwb9\nCookie=accountToken=KN9WW7k5gKgCnQLpnmWWM7LytAuSUwb9" -C "accountToken=KN9WW7k5gKgCnQLpnmWWM7LytAuSUwb9;"
# or pyidm

Example use with headers as postData, cookies and other parameters:

from idm import IDMan

downloader = IDMan()
url = "http://test.com/test.exe"

headers = {
    'Authorization': "Bearer KN9WW7k5gKgCnQLpnmWWM7LytAuSUwb9",
    'Cookie': 'accountToken=KN9WW7k5gKgCnQLpnmWWM7LytAuSUwb9',
}
cookies = {
    'accountToken': 'KN9WW7k5gKgCnQLpnmWWM7LytAuSUwb9'
}

username = "admin"
password = "admin123"
confirm = True
user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36"

downloader.download(url, r"c:\DOWNLOADS", "test_output.exe", "http://test.com/test.exe", cookies, headers, username, password, confirm, user_agent)

Command line usage

you can use idm or pyidm

usage: idm [-h] [-p PATH] [-o OUTPUT] [-c] [-a] [-r REFERRER] [-C COOKIE] [-D POST_DATA] [-U USERNAME] [-P PASSWORD] [-ua USER_AGENT] [-s] [--host HOST] [--port PORT] [--token TOKEN] [-A AGENT]
           [--agent-token AGENT_TOKEN] [--local] [-w] [--timeout TIMEOUT] [--no-webui] [--no-watcher] [--log-dir LOG_DIR] [-v] [--config CONFIG]
           [URLS ...]

Command line downloader with/Via Internet Download Manager(IDM)

Positional Arguments:
  URLS                  url to download, or "c" to get url from clipboard or a text file containing one link per line

Options:
  -h, --help            show this help message and exit
  -p, --path PATH       Path to save (default: current dir; on agent server: its configured path)
  -o, --output OUTPUT   Save with different name
  -c, --confirm         Confirm before download
  -a, --add             Add link to IDM without start downloading
  -r, --referrer REFERRER
                        Url referrer
  -C, --cookie COOKIE   Cookie string or dict
  -D, --post-data POST_DATA
                        Post Data string or dict
  -U, --username USERNAME
                        Username if require
  -P, --password PASSWORD
                        Password if require
  -ua, --user-agent USER_AGENT
                        Send with custom User-Agent string
  -s, --server          Run agent server: receive links over HTTP and forward them to IDM (COM)
  --host HOST           Agent server bind host (default: 127.0.0.1)
  --port PORT           Agent server port (default: 8899)
  --token TOKEN         Agent server token (or env PYIDM_TOKEN), required if host is not loopback
  -A, --agent AGENT     Send links to an agent server instead of local IDM, e.g. http://192.168.1.10:8899
  --agent-token AGENT_TOKEN
                        Token for the agent server (or env PYIDM_TOKEN)
  --local               Ignore configured agent url, send to local IDM
  -w, --wait            Wait until the download is complete (needs the IDM log watcher), exit code 2 on error/cancel/timeout
  --timeout TIMEOUT     Max seconds to wait with --wait (default: 3600, 0 = forever)
  --no-webui            Agent server: disable the web interface
  --no-watcher          Agent server: disable IDM log watching (download state tracking)
  --log-dir LOG_DIR     IDM log directory (default: %APPDATA%\IDM\DwnlData\<USERNAME>)
  -v, --verbose         Verbose agent server log
  --config CONFIG       set config, format section:option:value, for list valid section/option type "doc"

How the CLI decides where a link goes:

flowchart TD
    A["idm [options] URLS"] --> B{"--server ?"}
    B -- yes --> W{"Windows + COM + IDM ?"}
    W -- no --> X["message + exit 1"]
    W -- yes --> S["Start agent server<br/>(HTTP, queue, COM worker, web UI, log watcher)"]
    B -- no --> C["Expand URLS<br/>'c' = clipboard, file = one link per line"]
    C --> D{"--local ?"}
    D -- yes --> L
    D -- no --> E{"--agent or<br/>[agent] url set ?"}
    E -- yes --> G["POST /send to agent server"]
    E -- no --> L{"Windows + COM + IDM ?"}
    L -- no --> X
    L -- yes --> LD["IDMan.download() via COM"]
    G --> WT{"--wait ?"}
    LD --> WT
    WT -- yes --> TR["Poll agent (or local log watcher)<br/>until complete / error / cancelled"]
    WT -- no --> END["done"]
    TR --> END

Agent server mode

Run idm as a small HTTP agent on the Windows machine where IDM is installed. Any client (another PC, a script, curl, a browser extension, or the built-in web page) sends links to it, the agent forwards them to IDM through COM and then tells you what IDM did with them. Requests go through a queue and are executed one by one on a single COM worker thread. No extra dependency is needed (Python standard library only).

Architecture

flowchart LR
    subgraph Clients
        C1["idm -A (CLI, any OS)"]
        C2["curl / script"]
        C3["Browser: web interface"]
        C4["Other PC on LAN"]
    end

    subgraph Agent["pyidm agent  (idm --server, Windows)"]
        H["HTTP handler<br/>auth + validation"]
        UI["Web UI  GET /"]
        Q[("Send queue")]
        W["COM worker thread<br/>IDMan.download()"]
        J[("Job history<br/>last 200")]
        LW["Log watcher thread<br/>tails IDM logs"]
        H -->|"202 queued"| Q
        Q --> W
        W -->|"sent / failed"| J
        H -. "GET /jobs, /downloads" .-> J
        LW -->|"state per download"| J
        H --- UI
    end

    IDM[("Internet Download Manager")]
    LOGS[("IDM log files<br/>%APPDATA%\IDM\DwnlData\USER")]

    C1 -->|"POST /send"| H
    C2 -->|"POST /add"| H
    C3 -->|"same-origin fetch"| H
    C4 -->|"POST /send + token"| H
    W -->|"SendLinkToIDM2 (COM)"| IDM
    IDM -->|"writes"| LOGS
    LOGS -->|"read"| LW

Request flow, including completion tracking:

sequenceDiagram
    autonumber
    participant Client as Client (idm -A -w / web UI)
    participant HTTP as Agent HTTP handler
    participant Queue as Send queue
    participant Worker as COM worker
    participant IDM as IDM (COM)
    participant Log as IDM log files
    participant Watch as Log watcher

    Client->>HTTP: POST /send {urls, referrer, ...} + token
    HTTP->>HTTP: check token/origin, content-type, validate urls
    HTTP->>Queue: enqueue one job per url
    HTTP-->>Client: 202 {queued: N, jobs: [ids]}
    Queue->>Worker: next job
    Worker->>IDM: SendLinkToIDM2(link, referrer, cookie, ...)
    IDM-->>Worker: ok / COM error
    IDM->>Log: Adding file / Url / time, speed, downl ...
    Watch->>Log: tail new lines (every 1 s)
    Watch->>Watch: update state: added, downloading, complete ...
    loop until final state
        Client->>HTTP: GET /jobs/ID
        HTTP-->>Client: {status: done, state: downloading, download: {...}}
    end
    IDM->>Log: Download complete. / Rebuilding complete
    Client->>HTTP: GET /jobs/ID
    HTTP-->>Client: {state: complete}

Quick start

Start the agent (on the Windows machine where IDM is installed):

> idm --server                                              # 127.0.0.1:8899, no token (loopback only)
> idm --server --host 0.0.0.0 --port 8899 --token SECRET    # token is REQUIRED for non-loopback host
> idm --server -v                                           # log every request and job
> idm --server --no-webui --no-watcher                      # API only, no web page, no completion tracking

Send links to the agent from the command line (works on any OS):

> idm -A http://192.168.1.10:8899 --agent-token SECRET "http://test.com/test.exe" -r "http://test.com" -a
> idm -A 127.0.0.1:8899 links.txt          # text file, one link per line ('#' = comment)
> idm -A 127.0.0.1:8899 c                  # link(s) from clipboard
> idm -A 127.0.0.1:8899 -w "http://test.com/big.iso"   # wait until the download is complete (exit code 0), or failed (2)

Or with HTTP/JSON (Content-Type: application/json is required, token via X-Token or Authorization: Bearer):

curl -X POST http://127.0.0.1:8899/send -H "Content-Type: application/json" -H "X-Token: SECRET" \
     -d "{\"urls\": [\"http://test.com/test.exe\"], \"referrer\": \"http://test.com\"}"

Web interface

Open http://HOST:8899/ in a browser. It is a single embedded page (no external files, no CDN):

• paste one or more links, optional referrer / save path / "add only", press Send to IDM;
• table of the jobs sent through this agent with their live state, downloaded bytes, speed and save-as name;
• table of all IDM downloads found in IDM's log files (including ones you started in IDM itself);
• token field (kept in sessionStorage) when the agent runs with --token;
• refreshes every 2 seconds; disable with --no-webui.

The page itself is public (it contains no data); everything it shows comes from the API, which needs the token if one is set.

Download completion tracking

COM (SendLinkToIDM2) only hands a link over to IDM, it never reports back. So "was the link accepted" and "did the download finish" are two different questions:

The agent runs a small watcher thread that tails IDM's log files (%APPDATA%\IDM\DwnlData\<USERNAME>\*.log, override with [watcher] log_dir or --log-dir), recognises the progress lines (Url, to file, time .., speed .., downl .., Download complete., Rebuilding complete, Connecting..., Cancel by user., ...) and matches each log to a job by URL. Only logs touched in the last 5 minutes are read when the agent starts, so old history does not show up.

stateDiagram-v2
    [*] --> sent: link handed to IDM
    sent --> added: log "Adding file"
    added --> downloading: log "time, speed, downl"
    sent --> downloading
    downloading --> connecting: log "Connecting..."
    connecting --> downloading
    downloading --> finishing: Rename / Deleting temp
    finishing --> complete: "Download complete." / "Rebuilding complete"
    downloading --> complete
    downloading --> cancelled: "Cancel by user."
    downloading --> error: "last chunk. End rebuilding." without complete
    cancelled --> downloading: resumed in IDM
    error --> downloading: retried
    complete --> [*]

Notes:

• -a / add_only jobs stay added until you start them in IDM.
• complete is final immediately. error and cancelled are treated as final by --wait only after they stayed unchanged for 10 seconds, because IDM writes some of those lines during normal retries.
• If the log directory does not exist (IDM not run yet, other user, --no-watcher) the agent still works; state stays sent and /health reports "watcher": false. idm -w then returns right after sending and says that completion cannot be tracked.
• Log line patterns come from IDM's log format as observed on current IDM versions; if a future IDM changes the wording the state stays at its last known value.

HTTP API

Request body (JSON object):

Responses:

{"queued": 2, "jobs": ["a1a8d016346c", "3701fe02acc4"]}

{"id": "a1a8d016346c", "url": "http://test.com/test.exe", "status": "done", "state": "downloading", "error": null, "time": 1792912521.6,
 "download": {"state": "downloading", "speed": 3000, "downloaded": 15000, "saveas": "C:\\DL\\test.exe", "log": "1234.log", "updated": 1792912530.1}}

Job lifecycle

stateDiagram-v2
    [*] --> queued: POST /send or /add
    queued --> running: COM worker picks job
    running --> done: IDM accepted link
    running --> failed: COM error / IDM not installed
    done --> tracking: log watcher finds the download
    tracking --> [*]: complete / error / cancelled
    failed --> [*]

Only the last 200 jobs are kept in memory; history is cleared when the agent stops. GET /downloads is rebuilt from IDM's logs, so it survives agent restarts (within the 5 minute start window).

FAQ: what is the queue for?

Is the queue only for scheduling downloads? No. The agent queue only serialises sending links to IDM: COM objects are bound to one thread, so every request is queued and the COM worker hands the links to IDM one at a time. It does not delay, order or throttle the downloads themselves. Once IDM has the link it downloads immediately (or waits in IDM's own queue with add_only).

Python API

from idm import IDMan, AgentServer, agent_send, LogWatcher

# client (any OS)
res = agent_send("192.168.1.10:8899",
                 ["http://test.com/a.exe", "http://test.com/b.exe"],
                 {"referrer": "http://test.com", "add_only": True},
                 token="SECRET")
print(res)   # {'queued': 2, 'jobs': [...]}

# track completion locally (Windows)
w = LogWatcher()
w.start()
state = w.wait_final("http://test.com/a.exe", since=0)
print(state["state"])   # complete / error / cancelled

# embed the agent in your own program (blocks until Ctrl+C)
AgentServer(IDMan(), host="127.0.0.1", port=8899, token=None,
            defaults={"path": r"C:\DOWNLOADS"}, watcher=LogWatcher()).serve()

agent_send raises idm.AgentError when the agent is unreachable or replies with an error.

Configuration

Config file is idm.ini inside the package (change with idm --config section:option:value).

Precedence: command line option, then environment PYIDM_TOKEN (token only), then idm.ini, then built-in default.

Example:

> idm --config server:port:9000
> idm --config agent:url:http://192.168.1.10:9000
> idm --config agent:token:SECRET

Security

• The agent listens on 127.0.0.1 by default. Binding to any other host is refused unless a token is set.
• Without a token (loopback only) requests with a non-loopback Host header are rejected (DNS rebinding), and a request carrying an Origin header is accepted only when it is the agent's own origin (the built-in web page). A page on any other site cannot trigger downloads. Content-Type: application/json is mandatory for POST and no CORS headers are sent.
• With a token every endpoint except /health and the static page requires it (constant-time comparison).
• The web page is served with a strict Content-Security-Policy, X-Frame-Options: DENY and renders all data with textContent only.
• Traffic is plain HTTP. For access outside a trusted LAN put it behind a VPN or a TLS reverse proxy.
• path is a path on the agent machine; anyone holding the token can make the agent save files anywhere IDM can write.
• Credentials sent in username/password/cookie travel in the request body, protect the transport accordingly.

Run at Windows startup

schtasks /Create /SC ONLOGON /TN "pyidm-agent" /TR "idm --server --host 0.0.0.0 --token SECRET" /RL LIMITED

Remove with schtasks /Delete /TN "pyidm-agent" /F. The agent must run in the same logged-in user session as IDM (the IDM log directory is per user).

Troubleshooting

Support

• Python 3.7+
• Agent server / local IDM: Windows only (IDM, comtypes, pywin32)
• Agent client (idm -A, agent_send, web interface): any OS; for plain downloading on Linux you can also use pywget (pip install pywget) or wgetpanel

Tips

always provide ‘referrer’, some sites must have referrer in header

Links

• License: GPL
• Code: https://github.com/cumulus13/pyidm
• Issue tracker: https://github.com/cumulus13/pyidm/issues

Author

Hadi Cahyadi

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