File size: 8,276 Bytes
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import path from "path"
import { Context, Effect, Layer, Schedule, Schema } from "effect"
import { FetchHttpClient, HttpClient, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
import { FSUtil } from "../fs-util"
import { Global } from "../global"
import { makeGlobalNode } from "../effect/app-node"
import { httpClient } from "../effect/app-node-platform"
import { AbsolutePath } from "../schema"
const skillConcurrency = 4
const fileConcurrency = 8
function isSafeSegment(value: string) {
return (
value.length > 0 &&
value !== "." &&
value !== ".." &&
!value.includes("/") &&
!value.includes("\\") &&
!value.includes("\0")
)
}
function isSafeRelativePath(value: string) {
const segments = value.split("/")
return (
value.length > 0 &&
!value.includes("\\") &&
!value.includes("\0") &&
!value.includes("?") &&
!value.includes("#") &&
!URL.canParse(value) &&
!path.posix.isAbsolute(value) &&
!path.win32.isAbsolute(value) &&
segments.every((segment) => {
try {
const decoded = decodeURIComponent(segment)
return (
decoded.length > 0 &&
decoded !== "." &&
decoded !== ".." &&
!decoded.includes("/") &&
!decoded.includes("\\") &&
!decoded.includes("\0")
)
} catch {
return false
}
})
)
}
class IndexSkill extends Schema.Class<IndexSkill>("SkillDiscovery.IndexSkill")({
name: Schema.String,
version: Schema.optional(Schema.String),
files: Schema.Array(Schema.String),
}) {}
class Index extends Schema.Class<Index>("SkillDiscovery.Index")({
skills: Schema.Array(IndexSkill),
}) {}
export interface Interface {
readonly pull: (url: string) => Effect.Effect<AbsolutePath[]>
}
export class Service extends Context.Service<Service, Interface>()("@opencode/v2/SkillDiscovery") {}
const layer = Layer.effect(
Service,
Effect.gen(function* () {
const fs = yield* FSUtil.Service
const global = yield* Global.Service
const http = (yield* HttpClient.HttpClient).pipe(
HttpClient.retryTransient({
retryOn: "errors-and-responses",
times: 2,
schedule: Schedule.exponential(200).pipe(Schedule.jittered),
}),
HttpClient.filterStatusOk,
)
const download = Effect.fn("SkillDiscovery.download")(function* (url: string, destination: string) {
if (yield* fs.exists(destination).pipe(Effect.orDie)) return true
return yield* HttpClientRequest.get(url).pipe(
http.execute,
Effect.flatMap((response) => response.arrayBuffer),
Effect.flatMap((body) => fs.writeWithDirs(destination, new Uint8Array(body))),
Effect.as(true),
Effect.catch((error) =>
Effect.logError("failed to download skill file", { url, error }).pipe(Effect.as(false)),
),
)
})
return Service.of({
pull: Effect.fn("SkillDiscovery.pull")(function* (url) {
const base = url.endsWith("/") ? url : `${url}/`
const source = new URL(base)
const index = new URL("index.json", source).href
const data = yield* HttpClientRequest.get(index).pipe(
HttpClientRequest.acceptJson,
http.execute,
Effect.flatMap(HttpClientResponse.schemaBodyJson(Index)),
Effect.catch((error) =>
Effect.logError("failed to fetch skill index", { url: index, error }).pipe(Effect.as(undefined)),
),
)
if (!data) return []
const sourceRoot = path.resolve(global.cache, "skills", Bun.hash(base).toString(16))
return yield* Effect.forEach(
data.skills.flatMap((skill) => {
if (!isSafeSegment(skill.name)) {
return []
}
if (!skill.files.includes("SKILL.md") && !skill.files.includes(`${skill.name}.md`)) {
return []
}
const root = path.resolve(sourceRoot, skill.name)
if (!FSUtil.contains(sourceRoot, root) || root === sourceRoot) {
return []
}
const skillUrl = new URL(`${encodeURIComponent(skill.name)}/`, source)
const versionFile = path.join(root, ".opencode-version")
const files = skill.files.map((file) => {
if (!isSafeRelativePath(file)) return undefined
let resource: URL
try {
resource = new URL(file, skillUrl)
} catch {
return undefined
}
if (resource.origin !== source.origin) return undefined
const destination = path.resolve(root, file)
if (!FSUtil.contains(root, destination) || destination === root) return undefined
return {
url: resource.href,
destination,
file,
}
})
if (files.some((file) => file === undefined)) {
return []
}
return [{ skill, root, versionFile, files: files as { url: string; destination: string; file: string }[] }]
}),
({ skill, root, versionFile, files }) =>
Effect.gen(function* () {
const version = skill.version
const current =
version === undefined
? undefined
: yield* fs.readFileStringSafe(versionFile).pipe(Effect.catch(() => Effect.succeed(undefined)))
if (version === undefined || current === version) {
yield* Effect.forEach(files, (file) => download(file.url, file.destination), {
concurrency: fileConcurrency,
discard: true,
})
} else {
const token = crypto.randomUUID()
const staging = `${root}.tmp-${token}`
const backup = `${root}.old-${token}`
yield* Effect.gen(function* () {
const downloaded = yield* Effect.forEach(
files,
(file) => download(file.url, path.resolve(staging, file.file)),
{ concurrency: fileConcurrency },
)
if (!downloaded.every(Boolean)) return
const exists =
(yield* fs.exists(path.join(staging, "SKILL.md")).pipe(Effect.orDie)) ||
(yield* fs.exists(path.join(staging, `${skill.name}.md`)).pipe(Effect.orDie))
if (!exists) return
yield* fs.writeFileString(path.join(staging, ".opencode-version"), version)
yield* Effect.uninterruptible(
Effect.gen(function* () {
const cached = yield* fs.exists(root).pipe(Effect.orDie)
if (cached) yield* fs.rename(root, backup)
yield* fs.rename(staging, root).pipe(
Effect.catch((error) =>
Effect.gen(function* () {
if (cached) yield* fs.rename(backup, root).pipe(Effect.ignore)
return yield* Effect.fail(error)
}),
),
)
if (cached) yield* fs.remove(backup, { recursive: true, force: true }).pipe(Effect.ignore)
}),
)
}).pipe(
Effect.catch((error) => Effect.logError("failed to refresh skill", { skill: skill.name, error })),
Effect.ensuring(fs.remove(staging, { recursive: true, force: true }).pipe(Effect.ignore)),
)
}
const exists =
(yield* fs.exists(path.join(root, "SKILL.md")).pipe(Effect.orDie)) ||
(yield* fs.exists(path.join(root, `${skill.name}.md`)).pipe(Effect.orDie))
return exists ? [AbsolutePath.make(root)] : []
}),
{ concurrency: skillConcurrency },
).pipe(Effect.map((directories) => directories.flat()))
}),
})
}),
)
export const node = makeGlobalNode({ service: Service, layer, deps: [httpClient, FSUtil.node, Global.node] })
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