jelq

public

an http based roguelike rpg about jelqing

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//! The resources under `/runs/{id}`.

use std::{convert::Infallible, fmt::Write as _};

use axum::{
    Json,
    body::{Body, Bytes},
    http::{StatusCode, header},
    response::{IntoResponse, Response},
};
use serde_json::{Value, json};

use super::{
    ctx::Ctx,
    resource::{Resource, Verb},
    response::respond,
    run::{Greeting, RunResource, Scope},
};
use crate::{
    game::{
        Cause, Floor, Grip, Item, LUBRICANTS, Lube, PatchOp, Run, Technique,
        balance::{EQ_BAND, MM_PER_INCH},
        shaft,
    },
    headers::ACCEPT_PATCH,
    problem::Problem,
};

const fn home(verbs: &'static [Verb<Run>]) -> RunResource {
    RunResource {
        scope: Scope::Home,
        resource: Resource::new(verbs),
    }
}

const fn pockets(verbs: &'static [Verb<Run>]) -> RunResource {
    RunResource {
        scope: Scope::Pockets,
        resource: Resource::new(verbs),
    }
}

fn not_in_clinic(run: &Run) -> bool {
    run.floor != Floor::Clinic
}

fn never(_: &Run) -> bool {
    false
}

fn unreachable_handler(_: &mut Run, _: &Ctx) -> Response {
    StatusCode::METHOD_NOT_ALLOWED.into_response()
}

pub static RUN: RunResource = RunResource {
    scope: Scope::Home,
    resource: Resource {
        verbs: &[
            Verb::new("GET", get_run),
            Verb::new("JELQ", jelq)
                .only_when(not_in_clinic, "JELQ is not performed in the clinic."),
            Verb::new("PUT", put_run),
            Verb::new("PATCH", patch_run),
            Verb::new("DELETE", delete_run),
            Verb::new("TRACE", trace_run),
        ],
        accept_patch: true,
    },
};
pub static LENGTH: RunResource = home(&[Verb::new("GET", get_length)]);
pub static FORESKIN: RunResource = home(&[
    Verb::new("GET", get_foreskin),
    Verb::new("DELETE", delete_foreskin),
]);
pub static INVENTORY: RunResource = pockets(&[Verb::new("GET", get_inventory)]);
pub static ITEM: RunResource =
    pockets(&[Verb::new("GET", get_item), Verb::new("DELETE", delete_item)]);
pub static TECHNIQUES: RunResource = home(&[Verb::new("GET", get_techniques)]);
pub static DRAWER: RunResource = home(&[Verb::new("POST", search_drawer)]);
pub static BRANCH: RunResource = home(&[Verb::new("POST", choose_branch)]);
pub static FLOOR: RunResource =
    home(&[Verb::new("GET", get_floor), Verb::new("POST", leave_floor)]);
pub static SHOP: RunResource = home(&[Verb::new("GET", get_shop)]);
pub static BUY: RunResource = home(&[Verb::new("POST", buy)]);
pub static PORTAL: RunResource = pockets(&[
    Verb::new("GET", get_portal),
    Verb::new("POST", accept_portal),
]);
pub static ELDER: RunResource = home(&[Verb::new("GET", get_elder)]);
pub static GRIP: RunResource = home(&[Verb::new("GET", get_grip)]);
pub static DIAGNOSIS: RunResource = pockets(&[Verb::new("GET", get_diagnosis)]);
pub static FOOTAGE: RunResource = pockets(&[
    Verb::new("GET", get_footage),
    Verb::new("DELETE", unreachable_handler).only_when(
        never,
        "The footage has been cached by intermediaries. It cannot be deleted.",
    ),
]);

fn get_run(run: &mut Run, ctx: &Ctx) -> Response {
    if ctx
        .header(header::ACCEPT)
        .is_some_and(|accept| accept.contains("reassurance"))
    {
        return Problem::new(
            StatusCode::NOT_ACCEPTABLE,
            "no-reassurance",
            "The server does not produce reassurance.",
        )
        .into_response();
    }
    (
        StatusCode::OK,
        [(header::ETAG, run.etag())],
        Json(run.view()),
    )
        .into_response()
}

fn parse_techniques(run: &Run, ctx: &Ctx) -> Result<Vec<Technique>, Problem> {
    let required = || {
        Problem::new(
            StatusCode::BAD_REQUEST,
            "technique-required",
            "No technique was specified.",
        )
        .with("techniques", run.path("/techniques"))
    };
    let names = ctx
        .query("technique")
        .filter(|n| !n.trim().is_empty())
        .ok_or_else(required)?;
    names
        .split(',')
        .map(str::trim)
        .filter(|n| !n.is_empty())
        .map(|name| {
            Technique::parse(name).ok_or_else(|| {
                Problem::new(
                    StatusCode::BAD_REQUEST,
                    "unknown-technique",
                    format!("{name} is not a technique."),
                )
                .with("techniques", run.path("/techniques"))
            })
        })
        .collect()
}

fn parse_intensity(ctx: &Ctx) -> Result<i32, Problem> {
    match ctx.query("intensity").map(str::parse::<i32>) {
        None => Ok(5),
        Some(Ok(i)) if (1..=10).contains(&i) => Ok(i),
        Some(_) => Err(Problem::new(
            StatusCode::BAD_REQUEST,
            "intensity-out-of-range",
            "Intensity is measured from 1 to 10.",
        )),
    }
}

fn jelq(run: &mut Run, ctx: &Ctx) -> Response {
    let parsed = parse_techniques(run, ctx).and_then(|techniques| {
        let intensity = parse_intensity(ctx)?;
        let lube = Lube::from_content_type(ctx.header(header::CONTENT_TYPE))?;
        Ok((techniques, intensity, lube))
    });
    match parsed {
        Ok((techniques, intensity, lube)) => {
            respond(run.jelq(&techniques, intensity, lube, ctx.now))
        }
        Err(problem) => problem.into_response(),
    }
}

fn put_run(run: &mut Run, _: &Ctx) -> Response {
    run.put().into_response()
}

fn patch_run(run: &mut Run, ctx: &Ctx) -> Response {
    let is_patch = ctx
        .header(header::CONTENT_TYPE)
        .is_some_and(|ct| ct.starts_with("application/json-patch+json"));
    if !is_patch {
        return Problem::new(
            StatusCode::UNSUPPORTED_MEDIA_TYPE,
            "patch-format",
            "Patches are accepted as application/json-patch+json.",
        )
        .header(ACCEPT_PATCH, "application/json-patch+json")
        .into_response();
    }
    match serde_json::from_slice::<Vec<PatchOp>>(&ctx.body) {
        Ok(ops) => respond(run.patch(&ops)),
        Err(_) => Problem::new(
            StatusCode::BAD_REQUEST,
            "malformed-patch",
            "The patch could not be parsed.",
        )
        .into_response(),
    }
}

fn delete_run(run: &mut Run, _: &Ctx) -> Response {
    run.end(Cause::Abandoned);
    StatusCode::NO_CONTENT.into_response()
}

fn trace_run(run: &mut Run, ctx: &Ctx) -> Response {
    run.shame += 1;
    let mut message = format!("{} {} {:?}\r\n", ctx.method, ctx.uri, ctx.version);
    for (name, value) in &ctx.headers {
        let _ = write!(
            message,
            "{name}: {}\r\n",
            value.to_str().unwrap_or("<binary>")
        );
    }
    message.push_str("\r\n");
    (
        StatusCode::OK,
        [(header::CONTENT_TYPE, "message/http")],
        message,
    )
        .into_response()
}

fn millimetres(inches: f64) -> usize {
    (inches * MM_PER_INCH).round() as usize
}

enum InchRange {
    Satisfiable(f64, f64),
    Unsatisfiable,
}

/// `None` means the header is not a valid range, which RFC 9110 §14.2 says to ignore rather than refuse.
fn parse_inch_range(range: &str, total: f64) -> Option<InchRange> {
    let (start, end) = range.strip_prefix("inches=")?.split_once('-')?;
    let number = |text: &str| {
        text.parse::<f64>()
            .ok()
            .filter(|n| n.is_finite() && *n >= 0.0)
    };
    let (start, end) = match (start.trim(), end.trim()) {
        ("", "") => return None,
        ("", suffix) => ((total - number(suffix)?).max(0.0), total),
        (start, "") => (number(start)?, total),
        (start, end) => {
            let (start, end) = (number(start)?, number(end)?);
            if start > end {
                return None;
            }
            (start, end)
        }
    };
    Some(if start < total {
        InchRange::Satisfiable(start, end.min(total))
    } else {
        InchRange::Unsatisfiable
    })
}

fn get_length(run: &mut Run, ctx: &Ctx) -> Response {
    let inches = if run.items.ruler {
        run.current_length()
    } else {
        run.self_reported()
    };
    let body = shaft(millimetres(inches));
    let content_type = (
        header::CONTENT_TYPE,
        "text/plain; charset=us-ascii".to_owned(),
    );
    let accept_ranges = (header::ACCEPT_RANGES, "inches".to_owned());

    if let Some(range) = ctx
        .header(header::RANGE)
        .and_then(|range| parse_inch_range(range, inches))
    {
        let InchRange::Satisfiable(start, end) = range else {
            return Problem::new(
                StatusCode::RANGE_NOT_SATISFIABLE,
                "range-not-satisfiable",
                format!("The requested range is not available. {inches:.2} inches are."),
            )
            .header(header::CONTENT_RANGE, format!("inches */{inches:.2}"))
            .into_response();
        };
        let from = millimetres(start).min(body.len() - 1);
        let to = millimetres(end).clamp(from + 1, body.len());
        let content_range = (
            header::CONTENT_RANGE,
            format!("inches {start:.2}-{end:.2}/{inches:.2}"),
        );
        return (
            StatusCode::PARTIAL_CONTENT,
            [content_type, accept_ranges, content_range],
            body[from..to].to_owned(),
        )
            .into_response();
    }

    if run.items.ruler {
        return (StatusCode::OK, [content_type, accept_ranges], body).into_response();
    }
    let chunks: Vec<Result<Bytes, Infallible>> = body
        .into_bytes()
        .chunks(16)
        .map(|c| Ok(Bytes::copy_from_slice(c)))
        .collect();
    let body = Body::from_stream(futures_util::stream::iter(chunks));
    (StatusCode::OK, [content_type, accept_ranges], body).into_response()
}

fn get_foreskin(run: &mut Run, _: &Ctx) -> Response {
    if run.foreskin.is_none() {
        return Problem::new(
            StatusCode::GONE,
            "foreskin-gone",
            "The foreskin is gone. It will not be returning.",
        )
        .into_response();
    }
    (StatusCode::NO_CONTENT, [(header::ETAG, run.etag())]).into_response()
}

fn delete_foreskin(run: &mut Run, ctx: &Ctx) -> Response {
    respond(run.delete_foreskin(ctx.header(header::IF_MATCH)))
}

fn get_inventory(run: &mut Run, _: &Ctx) -> Response {
    let items: Vec<Value> = run
        .items
        .owned()
        .into_iter()
        .map(|item| {
            json!({
                "name": item.slug(),
                "href": run.path(&format!("/inventory/{}", item.slug())),
            })
        })
        .collect();
    Json(json!({
        "items": items,
        "ice_packs": run.items.ice_packs,
        "supplements": run.items.supplements,
        "excuses": run.excuses(),
    }))
    .into_response()
}

fn owned_item(run: &Run, ctx: &Ctx) -> Result<Item, Problem> {
    Item::parse(ctx.param("item"))
        .filter(|&item| run.items.has(item))
        .ok_or_else(|| {
            Problem::new(
                StatusCode::NOT_FOUND,
                "no-such-item",
                "You do not have that.",
            )
        })
}

fn get_item(run: &mut Run, ctx: &Ctx) -> Response {
    match owned_item(run, ctx) {
        Ok(item) => {
            Json(json!({ "name": item.slug(), "description": item.description() })).into_response()
        }
        Err(problem) => problem.into_response(),
    }
}

fn delete_item(run: &mut Run, ctx: &Ctx) -> Response {
    match owned_item(run, ctx) {
        Ok(item) => respond(run.drop_item(item)),
        Err(problem) => problem.into_response(),
    }
}

fn get_techniques(run: &mut Run, _: &Ctx) -> Response {
    let listed: Vec<Value> = Technique::ALL
        .into_iter()
        .map(|t| t.describe(run.forum_read()))
        .collect();
    Json(json!({
        "usage": format!("JELQ {}?technique=<name>[,<name>]&intensity=<1-10>", run.path("")),
        "lubricant": "Declared with Content-Type.",
        "lubricants": LUBRICANTS,
        "eq_band": [EQ_BAND.start(), EQ_BAND.end()],
        "techniques": listed,
    }))
    .into_response()
}

fn search_drawer(run: &mut Run, _: &Ctx) -> Response {
    respond(run.search_drawer())
}

fn choose_branch(run: &mut Run, ctx: &Ctx) -> Response {
    respond(run.choose(ctx.param("choice")))
}

fn get_floor(run: &mut Run, _: &Ctx) -> Response {
    Json(run.floor_view()).into_response()
}

fn leave_floor(run: &mut Run, _: &Ctx) -> Response {
    respond(run.advance())
}

fn get_shop(run: &mut Run, _: &Ctx) -> Response {
    respond(run.shop_view().map(Json))
}

fn buy(run: &mut Run, ctx: &Ctx) -> Response {
    respond(run.buy(ctx.param("item")))
}

fn get_portal(run: &mut Run, _: &Ctx) -> Response {
    Json(json!({
        "terms": "By connecting you agree that the hotel is not responsible for anything that happens in this room, and that it does not want to know.",
        "accept": { "href": run.path("/portal"), "method": "POST" },
    }))
    .into_response()
}

fn accept_portal(run: &mut Run, _: &Ctx) -> Response {
    respond(run.accept_terms())
}

fn get_elder(run: &mut Run, ctx: &Ctx) -> Response {
    respond(run.elder(
        ctx.header(header::PROXY_AUTHORIZATION),
        ctx.header(header::IF_MODIFIED_SINCE),
    ))
}

fn requested_grip(ctx: &Ctx) -> Option<Grip> {
    let connection = ctx.header(header::CONNECTION)?.to_ascii_lowercase();
    if !connection.split(',').any(|token| token.trim() == "upgrade") {
        return None;
    }
    ctx.header(header::UPGRADE)?
        .split(',')
        .find_map(|protocol| Grip::parse(protocol.trim()))
}

fn get_grip(run: &mut Run, ctx: &Ctx) -> Response {
    if let Some(grip) = requested_grip(ctx) {
        run.set_grip(grip);
        let mut response = (
            StatusCode::SWITCHING_PROTOCOLS,
            [
                (header::UPGRADE, grip.name()),
                (header::CONNECTION, "upgrade"),
            ],
        )
            .into_response();
        response.extensions_mut().insert(Greeting(format!(
            "You are now jelqing {}.\r\n",
            grip.name()
        )));
        return response;
    }
    let detail = match ctx.header(header::UPGRADE) {
        Some(protocol) => {
            format!("The server does not know the {protocol} grip. Grips are protocols.")
        }
        None => "Grips are protocols. Change grip by upgrading the connection.".to_owned(),
    };
    (
        StatusCode::OK,
        [(header::UPGRADE, "overhand, underhand")],
        Json(json!({ "grip": run.grip.name(), "detail": detail })),
    )
        .into_response()
}

fn get_diagnosis(run: &mut Run, ctx: &Ctx) -> Response {
    respond(run.diagnose(
        ctx.header(header::AUTHORIZATION),
        ctx.header(header::IF_NONE_MATCH),
    ))
}

fn get_footage(run: &mut Run, _: &Ctx) -> Response {
    let Some((filmed, age)) = run.footage() else {
        return Problem::new(
            StatusCode::NOT_FOUND,
            "no-footage",
            "There is no footage. Yet.",
        )
        .into_response();
    };
    (
        [
            (
                header::CACHE_CONTROL,
                "public, max-age=31536000, immutable".to_owned(),
            ),
            (header::AGE, age.to_string()),
            (header::LAST_MODIFIED, httpdate::fmt_http_date(filmed)),
        ],
        Json(json!({
            "detail": "A recording. It is grainy. It is unmistakably you. It has been shared.",
            "views": 1 + age * 37,
        })),
    )
        .into_response()
}

1	//! The resources under `/runs/{id}`.
2
3	use std::{convert::Infallible, fmt::Write as _};
4
5	use axum::{
6	Json,
7	body::{Body, Bytes},
8	http::{StatusCode, header},
9	response::{IntoResponse, Response},
10	};
11	use serde_json::{Value, json};
12
13	use super::{
14	ctx::Ctx,
15	resource::{Resource, Verb},
16	response::respond,
17	run::{Greeting, RunResource, Scope},
18	};
19	use crate::{
20	game::{
21	Cause, Floor, Grip, Item, LUBRICANTS, Lube, PatchOp, Run, Technique,
22	balance::{EQ_BAND, MM_PER_INCH},
23	shaft,
24	},
25	headers::ACCEPT_PATCH,
26	problem::Problem,
27	};
28
29	const fn home(verbs: &'static [Verb<Run>]) -> RunResource {
30	RunResource {
31	scope: Scope::Home,
32	resource: Resource::new(verbs),
33	}
34	}
35
36	const fn pockets(verbs: &'static [Verb<Run>]) -> RunResource {
37	RunResource {
38	scope: Scope::Pockets,
39	resource: Resource::new(verbs),
40	}
41	}
42
43	fn not_in_clinic(run: &Run) -> bool {
44	run.floor != Floor::Clinic
45	}
46
47	fn never(_: &Run) -> bool {
48	false
49	}
50
51	fn unreachable_handler(_: &mut Run, _: &Ctx) -> Response {
52	StatusCode::METHOD_NOT_ALLOWED.into_response()
53	}
54
55	pub static RUN: RunResource = RunResource {
56	scope: Scope::Home,
57	resource: Resource {
58	verbs: &[
59	Verb::new("GET", get_run),
60	Verb::new("JELQ", jelq)
61	.only_when(not_in_clinic, "JELQ is not performed in the clinic."),
62	Verb::new("PUT", put_run),
63	Verb::new("PATCH", patch_run),
64	Verb::new("DELETE", delete_run),
65	Verb::new("TRACE", trace_run),
66	],
67	accept_patch: true,
68	},
69	};
70	pub static LENGTH: RunResource = home(&[Verb::new("GET", get_length)]);
71	pub static FORESKIN: RunResource = home(&[
72	Verb::new("GET", get_foreskin),
73	Verb::new("DELETE", delete_foreskin),
74	]);
75	pub static INVENTORY: RunResource = pockets(&[Verb::new("GET", get_inventory)]);
76	pub static ITEM: RunResource =
77	pockets(&[Verb::new("GET", get_item), Verb::new("DELETE", delete_item)]);
78	pub static TECHNIQUES: RunResource = home(&[Verb::new("GET", get_techniques)]);
79	pub static DRAWER: RunResource = home(&[Verb::new("POST", search_drawer)]);
80	pub static BRANCH: RunResource = home(&[Verb::new("POST", choose_branch)]);
81	pub static FLOOR: RunResource =
82	home(&[Verb::new("GET", get_floor), Verb::new("POST", leave_floor)]);
83	pub static SHOP: RunResource = home(&[Verb::new("GET", get_shop)]);
84	pub static BUY: RunResource = home(&[Verb::new("POST", buy)]);
85	pub static PORTAL: RunResource = pockets(&[
86	Verb::new("GET", get_portal),
87	Verb::new("POST", accept_portal),
88	]);
89	pub static ELDER: RunResource = home(&[Verb::new("GET", get_elder)]);
90	pub static GRIP: RunResource = home(&[Verb::new("GET", get_grip)]);
91	pub static DIAGNOSIS: RunResource = pockets(&[Verb::new("GET", get_diagnosis)]);
92	pub static FOOTAGE: RunResource = pockets(&[
93	Verb::new("GET", get_footage),
94	Verb::new("DELETE", unreachable_handler).only_when(
95	never,
96	"The footage has been cached by intermediaries. It cannot be deleted.",
97	),
98	]);
99
100	fn get_run(run: &mut Run, ctx: &Ctx) -> Response {
101	if ctx
102	.header(header::ACCEPT)
103	.is_some_and(\|accept\| accept.contains("reassurance"))
104	{
105	return Problem::new(
106	StatusCode::NOT_ACCEPTABLE,
107	"no-reassurance",
108	"The server does not produce reassurance.",
109	)
110	.into_response();
111	}
112	(
113	StatusCode::OK,
114	[(header::ETAG, run.etag())],
115	Json(run.view()),
116	)
117	.into_response()
118	}
119
120	fn parse_techniques(run: &Run, ctx: &Ctx) -> Result<Vec<Technique>, Problem> {
121	let required = \|\| {
122	Problem::new(
123	StatusCode::BAD_REQUEST,
124	"technique-required",
125	"No technique was specified.",
126	)
127	.with("techniques", run.path("/techniques"))
128	};
129	let names = ctx
130	.query("technique")
131	.filter(\|n\| !n.trim().is_empty())
132	.ok_or_else(required)?;
133	names
134	.split(',')
135	.map(str::trim)
136	.filter(\|n\| !n.is_empty())
137	.map(\|name\| {
138	Technique::parse(name).ok_or_else(\|\| {
139	Problem::new(
140	StatusCode::BAD_REQUEST,
141	"unknown-technique",
142	format!("{name} is not a technique."),
143	)
144	.with("techniques", run.path("/techniques"))
145	})
146	})
147	.collect()
148	}
149
150	fn parse_intensity(ctx: &Ctx) -> Result<i32, Problem> {
151	match ctx.query("intensity").map(str::parse::<i32>) {
152	None => Ok(5),
153	Some(Ok(i)) if (1..=10).contains(&i) => Ok(i),
154	Some(_) => Err(Problem::new(
155	StatusCode::BAD_REQUEST,
156	"intensity-out-of-range",
157	"Intensity is measured from 1 to 10.",
158	)),
159	}
160	}
161
162	fn jelq(run: &mut Run, ctx: &Ctx) -> Response {
163	let parsed = parse_techniques(run, ctx).and_then(\|techniques\| {
164	let intensity = parse_intensity(ctx)?;
165	let lube = Lube::from_content_type(ctx.header(header::CONTENT_TYPE))?;
166	Ok((techniques, intensity, lube))
167	});
168	match parsed {
169	Ok((techniques, intensity, lube)) => {
170	respond(run.jelq(&techniques, intensity, lube, ctx.now))
171	}
172	Err(problem) => problem.into_response(),
173	}
174	}
175
176	fn put_run(run: &mut Run, _: &Ctx) -> Response {
177	run.put().into_response()
178	}
179
180	fn patch_run(run: &mut Run, ctx: &Ctx) -> Response {
181	let is_patch = ctx
182	.header(header::CONTENT_TYPE)
183	.is_some_and(\|ct\| ct.starts_with("application/json-patch+json"));
184	if !is_patch {
185	return Problem::new(
186	StatusCode::UNSUPPORTED_MEDIA_TYPE,
187	"patch-format",
188	"Patches are accepted as application/json-patch+json.",
189	)
190	.header(ACCEPT_PATCH, "application/json-patch+json")
191	.into_response();
192	}
193	match serde_json::from_slice::<Vec<PatchOp>>(&ctx.body) {
194	Ok(ops) => respond(run.patch(&ops)),
195	Err(_) => Problem::new(
196	StatusCode::BAD_REQUEST,
197	"malformed-patch",
198	"The patch could not be parsed.",
199	)
200	.into_response(),
201	}
202	}
203
204	fn delete_run(run: &mut Run, _: &Ctx) -> Response {
205	run.end(Cause::Abandoned);
206	StatusCode::NO_CONTENT.into_response()
207	}
208
209	fn trace_run(run: &mut Run, ctx: &Ctx) -> Response {
210	run.shame += 1;
211	let mut message = format!("{} {} {:?}\r\n", ctx.method, ctx.uri, ctx.version);
212	for (name, value) in &ctx.headers {
213	let _ = write!(
214	message,
215	"{name}: {}\r\n",
216	value.to_str().unwrap_or("<binary>")
217	);
218	}
219	message.push_str("\r\n");
220	(
221	StatusCode::OK,
222	[(header::CONTENT_TYPE, "message/http")],
223	message,
224	)
225	.into_response()
226	}
227
228	fn millimetres(inches: f64) -> usize {
229	(inches * MM_PER_INCH).round() as usize
230	}
231
232	enum InchRange {
233	Satisfiable(f64, f64),
234	Unsatisfiable,
235	}
236
237	/// `None` means the header is not a valid range, which RFC 9110 §14.2 says to ignore rather than refuse.
238	fn parse_inch_range(range: &str, total: f64) -> Option<InchRange> {
239	let (start, end) = range.strip_prefix("inches=")?.split_once('-')?;
240	let number = \|text: &str\| {
241	text.parse::<f64>()
242	.ok()
243	.filter(\|n\| n.is_finite() && *n >= 0.0)
244	};
245	let (start, end) = match (start.trim(), end.trim()) {
246	("", "") => return None,
247	("", suffix) => ((total - number(suffix)?).max(0.0), total),
248	(start, "") => (number(start)?, total),
249	(start, end) => {
250	let (start, end) = (number(start)?, number(end)?);
251	if start > end {
252	return None;
253	}
254	(start, end)
255	}
256	};
257	Some(if start < total {
258	InchRange::Satisfiable(start, end.min(total))
259	} else {
260	InchRange::Unsatisfiable
261	})
262	}
263
264	fn get_length(run: &mut Run, ctx: &Ctx) -> Response {
265	let inches = if run.items.ruler {
266	run.current_length()
267	} else {
268	run.self_reported()
269	};
270	let body = shaft(millimetres(inches));
271	let content_type = (
272	header::CONTENT_TYPE,
273	"text/plain; charset=us-ascii".to_owned(),
274	);
275	let accept_ranges = (header::ACCEPT_RANGES, "inches".to_owned());
276
277	if let Some(range) = ctx
278	.header(header::RANGE)
279	.and_then(\|range\| parse_inch_range(range, inches))
280	{
281	let InchRange::Satisfiable(start, end) = range else {
282	return Problem::new(
283	StatusCode::RANGE_NOT_SATISFIABLE,
284	"range-not-satisfiable",
285	format!("The requested range is not available. {inches:.2} inches are."),
286	)
287	.header(header::CONTENT_RANGE, format!("inches */{inches:.2}"))
288	.into_response();
289	};
290	let from = millimetres(start).min(body.len() - 1);
291	let to = millimetres(end).clamp(from + 1, body.len());
292	let content_range = (
293	header::CONTENT_RANGE,
294	format!("inches {start:.2}-{end:.2}/{inches:.2}"),
295	);
296	return (
297	StatusCode::PARTIAL_CONTENT,
298	[content_type, accept_ranges, content_range],
299	body[from..to].to_owned(),
300	)
301	.into_response();
302	}
303
304	if run.items.ruler {
305	return (StatusCode::OK, [content_type, accept_ranges], body).into_response();
306	}
307	let chunks: Vec<Result<Bytes, Infallible>> = body
308	.into_bytes()
309	.chunks(16)
310	.map(\|c\| Ok(Bytes::copy_from_slice(c)))
311	.collect();
312	let body = Body::from_stream(futures_util::stream::iter(chunks));
313	(StatusCode::OK, [content_type, accept_ranges], body).into_response()
314	}
315
316	fn get_foreskin(run: &mut Run, _: &Ctx) -> Response {
317	if run.foreskin.is_none() {
318	return Problem::new(
319	StatusCode::GONE,
320	"foreskin-gone",
321	"The foreskin is gone. It will not be returning.",
322	)
323	.into_response();
324	}
325	(StatusCode::NO_CONTENT, [(header::ETAG, run.etag())]).into_response()
326	}
327
328	fn delete_foreskin(run: &mut Run, ctx: &Ctx) -> Response {
329	respond(run.delete_foreskin(ctx.header(header::IF_MATCH)))
330	}
331
332	fn get_inventory(run: &mut Run, _: &Ctx) -> Response {
333	let items: Vec<Value> = run
334	.items
335	.owned()
336	.into_iter()
337	.map(\|item\| {
338	json!({
339	"name": item.slug(),
340	"href": run.path(&format!("/inventory/{}", item.slug())),
341	})
342	})
343	.collect();
344	Json(json!({
345	"items": items,
346	"ice_packs": run.items.ice_packs,
347	"supplements": run.items.supplements,
348	"excuses": run.excuses(),
349	}))
350	.into_response()
351	}
352
353	fn owned_item(run: &Run, ctx: &Ctx) -> Result<Item, Problem> {
354	Item::parse(ctx.param("item"))
355	.filter(\|&item\| run.items.has(item))
356	.ok_or_else(\|\| {
357	Problem::new(
358	StatusCode::NOT_FOUND,
359	"no-such-item",
360	"You do not have that.",
361	)
362	})
363	}
364
365	fn get_item(run: &mut Run, ctx: &Ctx) -> Response {
366	match owned_item(run, ctx) {
367	Ok(item) => {
368	Json(json!({ "name": item.slug(), "description": item.description() })).into_response()
369	}
370	Err(problem) => problem.into_response(),
371	}
372	}
373
374	fn delete_item(run: &mut Run, ctx: &Ctx) -> Response {
375	match owned_item(run, ctx) {
376	Ok(item) => respond(run.drop_item(item)),
377	Err(problem) => problem.into_response(),
378	}
379	}
380
381	fn get_techniques(run: &mut Run, _: &Ctx) -> Response {
382	let listed: Vec<Value> = Technique::ALL
383	.into_iter()
384	.map(\|t\| t.describe(run.forum_read()))
385	.collect();
386	Json(json!({
387	"usage": format!("JELQ {}?technique=<name>[,<name>]&intensity=<1-10>", run.path("")),
388	"lubricant": "Declared with Content-Type.",
389	"lubricants": LUBRICANTS,
390	"eq_band": [EQ_BAND.start(), EQ_BAND.end()],
391	"techniques": listed,
392	}))
393	.into_response()
394	}
395
396	fn search_drawer(run: &mut Run, _: &Ctx) -> Response {
397	respond(run.search_drawer())
398	}
399
400	fn choose_branch(run: &mut Run, ctx: &Ctx) -> Response {
401	respond(run.choose(ctx.param("choice")))
402	}
403
404	fn get_floor(run: &mut Run, _: &Ctx) -> Response {
405	Json(run.floor_view()).into_response()
406	}
407
408	fn leave_floor(run: &mut Run, _: &Ctx) -> Response {
409	respond(run.advance())
410	}
411
412	fn get_shop(run: &mut Run, _: &Ctx) -> Response {
413	respond(run.shop_view().map(Json))
414	}
415
416	fn buy(run: &mut Run, ctx: &Ctx) -> Response {
417	respond(run.buy(ctx.param("item")))
418	}
419
420	fn get_portal(run: &mut Run, _: &Ctx) -> Response {
421	Json(json!({
422	"terms": "By connecting you agree that the hotel is not responsible for anything that happens in this room, and that it does not want to know.",
423	"accept": { "href": run.path("/portal"), "method": "POST" },
424	}))
425	.into_response()
426	}
427
428	fn accept_portal(run: &mut Run, _: &Ctx) -> Response {
429	respond(run.accept_terms())
430	}
431
432	fn get_elder(run: &mut Run, ctx: &Ctx) -> Response {
433	respond(run.elder(
434	ctx.header(header::PROXY_AUTHORIZATION),
435	ctx.header(header::IF_MODIFIED_SINCE),
436	))
437	}
438
439	fn requested_grip(ctx: &Ctx) -> Option<Grip> {
440	let connection = ctx.header(header::CONNECTION)?.to_ascii_lowercase();
441	if !connection.split(',').any(\|token\| token.trim() == "upgrade") {
442	return None;
443	}
444	ctx.header(header::UPGRADE)?
445	.split(',')
446	.find_map(\|protocol\| Grip::parse(protocol.trim()))
447	}
448
449	fn get_grip(run: &mut Run, ctx: &Ctx) -> Response {
450	if let Some(grip) = requested_grip(ctx) {
451	run.set_grip(grip);
452	let mut response = (
453	StatusCode::SWITCHING_PROTOCOLS,
454	[
455	(header::UPGRADE, grip.name()),
456	(header::CONNECTION, "upgrade"),
457	],
458	)
459	.into_response();
460	response.extensions_mut().insert(Greeting(format!(
461	"You are now jelqing {}.\r\n",
462	grip.name()
463	)));
464	return response;
465	}
466	let detail = match ctx.header(header::UPGRADE) {
467	Some(protocol) => {
468	format!("The server does not know the {protocol} grip. Grips are protocols.")
469	}
470	None => "Grips are protocols. Change grip by upgrading the connection.".to_owned(),
471	};
472	(
473	StatusCode::OK,
474	[(header::UPGRADE, "overhand, underhand")],
475	Json(json!({ "grip": run.grip.name(), "detail": detail })),
476	)
477	.into_response()
478	}
479
480	fn get_diagnosis(run: &mut Run, ctx: &Ctx) -> Response {
481	respond(run.diagnose(
482	ctx.header(header::AUTHORIZATION),
483	ctx.header(header::IF_NONE_MATCH),
484	))
485	}
486
487	fn get_footage(run: &mut Run, _: &Ctx) -> Response {
488	let Some((filmed, age)) = run.footage() else {
489	return Problem::new(
490	StatusCode::NOT_FOUND,
491	"no-footage",
492	"There is no footage. Yet.",
493	)
494	.into_response();
495	};
496	(
497	[
498	(
499	header::CACHE_CONTROL,
500	"public, max-age=31536000, immutable".to_owned(),
501	),
502	(header::AGE, age.to_string()),
503	(header::LAST_MODIFIED, httpdate::fmt_http_date(filmed)),
504	],
505	Json(json!({
506	"detail": "A recording. It is grainy. It is unmistakably you. It has been shared.",
507	"views": 1 + age * 37,
508	})),
509	)
510	.into_response()
511	}