Calendly

use calendly.qweruse calendly_uuid, calendly_me from calendly      // Quillo 0.6: only these

ureq = "2"hmac = "0.12"sha2 = "0.10"hex = "0.4"serde_json = { version = "1", features = ["preserve_order"] }

// Bookings from Calendly: who is signed in, the event types on offer, what is booked and who comes,// a cancellation, a webhook subscription, and a booking arriving by webhook.////   CALENDLY_TOKEN=... CALENDLY_SIGNING_KEY=... quillo run calendly.qwe//   then open /me, /events, /invitees, /subscription, /hook-check and /failures//// CALENDLY_API_URL reaches a test server. Point the subscription at POST /calendly/webhook.use "calendly.qwer"route GET /me {    let me = calendly_me()?    { name: me.name, types: len(calendly_event_types({ active: true }, 0)?), capped: len(calendly_event_types({}, 130)?), first: calendly_event_types({}, 1)?[0].name }}route GET /events {    let all = calendly_events({ status: "active", min_start_time: "2026-11-01T00:00:00Z" }, 0)?    let one = calendly_event(all[0].uri)?    let gone = calendly_cancel(all[1].uri, "Double booked")?    {        count: len(all), same: one.uri == all[0].uri, reason: gone.reason, by: gone.canceler_type,        state: calendly_event(all[1].uri)?.status,        twice: calendly_cancel(all[1].uri, "").error,        bad_filter: calendly_events({ min_start_time: "soon" }, 0).error,    }}route GET /invitees {    let e = calendly_events({ status: "active" }, 1)?[0]    { all: len(calendly_invitees(e.uri, {}, 0)?), named: map(calendly_invitees(e.uri, { email: "invitee7@example.com" }, 0)?, (i) => i.name), by_uuid: len(calendly_invitees(calendly_uuid(e.uri), {}, 5)?) }}route GET /subscription {    let s = calendly_webhook_create("https://example.com/calendly/webhook", ["invitee.created", "invitee.canceled"], "user", "my-signing-key")?    {        state: s.state, listed: len(calendly_webhooks("user")?),        deleted: calendly_webhook_delete(s.uri)?, left: len(calendly_webhooks("user")?),        no_key: calendly_webhook_create("https://x.example", ["invitee.created"], "user", "").error,        no_events: calendly_webhook_create("https://x.example", [], "user", "k").error,        scope: calendly_webhook_create("https://x.example", ["invitee.created"], "team", "k").error,        not_https: calendly_webhook_create("http://x.example", ["invitee.created"], "user", "k").error,    }}route POST /calendly/webhook {    let hook = calendly_webhook(request.body, request.headers["calendly-webhook-signature"] ?? "", env("CALENDLY_SIGNING_KEY", ""), 180)    if is_err(hook) { reply 401 hook.error }    { got: hook.event, who: hook.payload.email }}// A signature made outside this plugin, by node's crypto: an old time, so no tolerance for "good".route GET /hook-check {    let body = "{\"created_at\":\"2026-11-01T10:00:00.000000Z\",\"event\":\"invitee.created\",\"payload\":{\"email\":\"ada@example.com\",\"name\":\"Ada\"}}"    let header = "t=1492774577,v1=dd14f24c071920721ae1a9d70b322717c15410ff3feb6ce74f827e473d5fe471"    let fresh = calendly_webhook_sign(body, "wh-key", 0)    {        good: calendly_webhook(body, header, "wh-key", 0)?.payload.email,        event: calendly_webhook(body, fresh, "wh-key", 180)?.event,        replay: contains(calendly_webhook(body, header, "wh-key", 180).error, "more than the 180 s allowed: a replay?"),        tampered: calendly_webhook(body + " ", header, "wh-key", 0).error,        no_v1: calendly_webhook(body, "t=1", "wh-key", 0).error,        unsigned: calendly_webhook(body, "", "wh-key", 0).error,    }}route GET /uuids = {    uri: calendly_uuid("https://api.calendly.com/scheduled_events/GBGBDCAADAEDCRZ2"),    tail: calendly_uuid("https://api.calendly.com/users/AAAA/"),    bare: calendly_uuid("ABC"),}route GET /failures = {    missing: calendly_event("NOSUCH").error,    waited: calendly_event("busy")?.name,}

//! Calendly's API v2 without an SDK: who you are, event types, scheduled events and their invitees, lists through page tokens, cancels, webhook subscriptions, Calendly's error details read, resource addresses shortened to uuids, and the Calendly-Webhook-Signature checked with its timestamp tolerance.//! version: 1.0.0//!//! [dependencies]//! ureq = "2"//! hmac = "0.12"//! sha2 = "0.10"//! hex = "0.4"//! serde_json = { version = "1", features = ["preserve_order"] }use hmac::{Hmac, Mac};use serde_json::{json, Value};use std::time::{Duration, SystemTime, UNIX_EPOCH};// CALENDLY_TOKEN is a personal access token or an OAuth token; CALENDLY_API_URL the API// (https://api.calendly.com when not set).fn setting(k: &str) -> Option<String> {    std::env::var(k).ok().filter(|v| !v.is_empty())}fn api() -> String {    setting("CALENDLY_API_URL").unwrap_or_else(|| "https://api.calendly.com".into()).trim_end_matches('/').to_string()}fn enc(s: &str) -> String {    s.bytes().map(|b| if b.is_ascii_alphanumeric() || b"-_.~".contains(&b) { (b as char).to_string() } else { format!("%{:02X}", b) }).collect()}fn error_text(status: u16, text: &str) -> String {    let v: Value = serde_json::from_str(text).unwrap_or(Value::Null);    let Some(m) = v["message"].as_str() else {        return format!("Calendly {}: {}", status, text.trim().chars().take(300).collect::<String>());    };    let details: Vec<String> = v["details"].as_array().into_iter().flatten().map(|d| format!("{}: {}", d["parameter"].as_str().unwrap_or("?"), d["message"].as_str().unwrap_or(""))).collect();    let tail = if details.is_empty() { String::new() } else { format!(" ({})", details.join("; ")) };    format!("Calendly {} {}: {}{}", status, v["title"].as_str().unwrap_or(""), m, tail)}fn call(method: &str, path: &str, body: Option<&Value>) -> Result<Value, String> {    let token = setting("CALENDLY_TOKEN").ok_or("CALENDLY_TOKEN is not set")?;    let url = format!("{}{}", api(), path);    let agent = ureq::AgentBuilder::new().timeout(Duration::from_secs(30)).build();    for attempt in 0..5u32 {        let req = agent.request(method, &url).set("Authorization", &format!("Bearer {}", token)).set("Accept", "application/json");        let res = match body {            Some(b) => req.set("Content-Type", "application/json").send_string(&b.to_string()),            None => req.call(),        };        match res {            Ok(r) => {                let t = r.into_string().map_err(|e| e.to_string())?;                return if t.trim().is_empty() { Ok(Value::Null) } else { serde_json::from_str(&t).map_err(|_| format!("Calendly's answer is not JSON: {}", t.chars().take(200).collect::<String>())) };            }            Err(ureq::Error::Status(429, r)) if attempt < 4 => {                let wait = r.header("Retry-After").or(r.header("X-RateLimit-Reset")).and_then(|s| s.parse::<u64>().ok()).map_or(1000u64 << attempt, |s| s * 1000);                std::thread::sleep(Duration::from_millis(wait.min(60_000)));            }            Err(ureq::Error::Status(c, r)) => return Err(error_text(c, &r.into_string().unwrap_or_default())),            Err(e) => return Err(format!("cannot reach Calendly at {}: {}", api(), e)),        }    }    Err("Calendly stayed over its limit through five tries".into())}fn walk(path: &str, filter: &Value, max_items: i64) -> Result<Vec<Value>, String> {    let mut parts = vec!["count=100".to_string()];    if let Some(m) = filter.as_object() {        for (k, v) in m {            if !v.is_null() {                parts.push(format!("{}={}", enc(k), enc(&v.as_str().map(str::to_string).unwrap_or_else(|| v.to_string()))));            }        }    }    let base = parts.join("&");    let mut token: Option<String> = None;    let mut out = vec![];    loop {        let q = token.as_ref().map_or(base.clone(), |t| format!("{}&page_token={}", base, enc(t)));        let v = call("GET", &format!("{}?{}", path, q), None)?;        out.extend(v["collection"].as_array().cloned().unwrap_or_default());        if max_items > 0 && out.len() as i64 >= max_items {            out.truncate(max_items as usize);            return Ok(out);        }        match v["pagination"]["next_page_token"].as_str() {            Some(t) => token = Some(t.to_string()),            None => return Ok(out),        }    }}/// The last part of a Calendly resource address: `calendly_uuid("https://api.calendly.com/scheduled_events/ABC")` is "ABC". A bare uuid comes back as it is.pub fn calendly_uuid(resource: &str) -> String {    resource.trim_end_matches('/').rsplit('/').next().unwrap_or("").to_string()}/// The token's user: { uri, name, email, current_organization... }.pub fn calendly_me() -> Result<serde_json::Value, String> {    Ok(call("GET", "/users/me", None)?["resource"].clone())}fn owner(filter: serde_json::Value) -> Result<Value, String> {    let mut f = if filter.is_object() { filter } else { json!({}) };    if f["user"].is_null() && f["organization"].is_null() {        f["user"] = calendly_me()?["uri"].clone();    }    Ok(f)}/// Event types through every page: `filter` takes `user` or `organization` (the token's user if neither), `active`, `sort`; `max_items` caps them (0: all).pub fn calendly_event_types(filter: serde_json::Value, max_items: i64) -> Result<Vec<serde_json::Value>, String> {    walk("/event_types", &owner(filter)?, max_items)}/// Scheduled events through every page: `filter` takes `user` or `organization`, `status` ("active", "canceled"), `min_start_time`, `max_start_time`, `invitee_email`, `sort`; `max_items` caps them (0: all).pub fn calendly_events(filter: serde_json::Value, max_items: i64) -> Result<Vec<serde_json::Value>, String> {    walk("/scheduled_events", &owner(filter)?, max_items)}/// One scheduled event, by uuid or address.pub fn calendly_event(event: &str) -> Result<serde_json::Value, String> {    Ok(call("GET", &format!("/scheduled_events/{}", enc(&calendly_uuid(event))), None)?["resource"].clone())}/// An event's invitees through every page; `filter` takes `status`, `email`, `sort`; `max_items` caps them (0: all).pub fn calendly_invitees(event: &str, filter: serde_json::Value, max_items: i64) -> Result<Vec<serde_json::Value>, String> {    walk(&format!("/scheduled_events/{}/invitees", enc(&calendly_uuid(event))), &filter, max_items)}/// Cancels a scheduled event, telling invitees `reason` (may be ""). Gives Calendly's cancellation.pub fn calendly_cancel(event: &str, reason: &str) -> Result<serde_json::Value, String> {    Ok(call("POST", &format!("/scheduled_events/{}/cancellation", enc(&calendly_uuid(event))), Some(&json!({ "reason": reason })))?["resource"].clone())}/// Subscribes `url` to `events` ("invitee.created", "invitee.canceled"...): `scope` is "user" or "organization" and `signing_key` a secret of yours, which Calendly signs with. A key left out cannot be fetched later, so this refuses one that is empty.pub fn calendly_webhook_create(url: &str, events: Vec<String>, scope: &str, signing_key: &str) -> Result<serde_json::Value, String> {    if events.is_empty() {        return Err("a subscription needs at least one event".into());    }    if signing_key.is_empty() {        return Err("give a signing key, or nothing can check what arrives".into());    }    let me = calendly_me()?;    let mut b = json!({ "url": url, "events": events, "scope": scope, "organization": me["current_organization"], "signing_key": signing_key });    match scope {        "user" => b["user"] = me["uri"].clone(),        "organization" => {}        o => return Err(format!("`{}` is not a scope: \"user\" or \"organization\"", o)),    }    Ok(call("POST", "/webhook_subscriptions", Some(&b))?["resource"].clone())}/// The subscriptions for a `scope`, through every page.pub fn calendly_webhooks(scope: &str) -> Result<Vec<serde_json::Value>, String> {    let me = calendly_me()?;    let mut f = json!({ "organization": me["current_organization"], "scope": scope });    if scope == "user" {        f["user"] = me["uri"].clone();    }    walk("/webhook_subscriptions", &f, 0)}/// Deletes a subscription, by uuid or address.pub fn calendly_webhook_delete(id: &str) -> Result<bool, String> {    call("DELETE", &format!("/webhook_subscriptions/{}", enc(&calendly_uuid(id))), None)?;    Ok(true)}fn sign(t: &str, body: &str, key: &str) -> Hmac<sha2::Sha256> {    let mut m = Hmac::<sha2::Sha256>::new_from_slice(key.as_bytes()).expect("HMAC takes any key");    m.update(t.as_bytes());    m.update(b".");    m.update(body.as_bytes());    m}/// Checks a webhook: `header` the Calendly-Webhook-Signature (`t=...,v1=...`), `body` raw, `signing_key` yours, refused when signed more than `tolerance_seconds` ago (Calendly's example uses 180; 0 skips that). Gives { event, created_at, payload }.pub fn calendly_webhook(body: &str, header: &str, signing_key: &str, tolerance_seconds: i64) -> Result<serde_json::Value, String> {    if header.is_empty() {        return Err("no Calendly-Webhook-Signature header: this did not come from Calendly".into());    }    let mut t = None;    let mut sig = None;    for part in header.split(',') {        match part.trim().split_once('=') {            Some(("t", v)) => t = Some(v.to_string()),            Some(("v1", v)) => sig = Some(v.to_string()),            _ => {}        }    }    let (t, sig) = (t.ok_or("the signature header has no t=")?, sig.ok_or("the signature header has no v1=")?);    let raw = hex::decode(&sig).map_err(|_| "the signature is not hex".to_string())?;    if sign(&t, body, signing_key).verify_slice(&raw).is_err() {        return Err("the webhook's signature does not match: a wrong signing key, or the body was changed (use the raw body)".into());    }    let at: i64 = t.parse().map_err(|_| format!("the timestamp `{}` is not a number", t))?;    let now = SystemTime::now().duration_since(UNIX_EPOCH).map_or(0, |d| d.as_secs() as i64);    if tolerance_seconds > 0 && (now - at).abs() > tolerance_seconds {        return Err(format!("the webhook was signed {} s ago, more than the {} s allowed: a replay?", (now - at).abs(), tolerance_seconds));    }    let v: Value = serde_json::from_str(body).map_err(|e| format!("the webhook's body is not JSON: {}", e))?;    Ok(json!({ "event": v["event"], "created_at": v["created_at"], "payload": v["payload"] }))}/// A Calendly-Webhook-Signature for `body` at time `t` (0: now), for tests.pub fn calendly_webhook_sign(body: &str, signing_key: &str, t: i64) -> String {    let at = if t > 0 { t } else { SystemTime::now().duration_since(UNIX_EPOCH).map_or(0, |d| d.as_secs() as i64) }.to_string();    format!("t={},v1={}", at, hex::encode(sign(&at, body, signing_key).finalize().into_bytes()))}