108 lines
4.1 KiB
Go
108 lines
4.1 KiB
Go
package provider
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import (
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"crypto/rand"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"net/http"
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"regexp"
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"strings"
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)
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// OpenCodeVersion is the OpenCode release magpie says it is to OpenCode's
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// gateway. Zen's free tier turns away anything older than 1.18.0 (426
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// "OpenCode 1.18.0 or newer is required to use the free tier").
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const OpenCodeVersion = "1.18.34"
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// OpenCodeAnonymousKey is the key OpenCode asks Zen with when no one is
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// signed in to it, which Zen's free models answer.
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const OpenCodeAnonymousKey = "public"
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// OpenCodeClient makes a request to OpenCode's gateway (Zen or Go) carry
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// what OpenCode itself sends there (packages/opencode/src/session/llm/
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// request.ts, for a provider whose id starts with "opencode"): its
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// User-Agent, the session in x-opencode-session, the turn in
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// x-opencode-request, and x-opencode-client and x-opencode-project. Zen's
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// free models are served to no one else ("OpenCode's free tier can only be
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// used from within OpenCode"). session names the conversation; one already
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// in OpenCode's form (ses_…) goes as it is, any other becomes one, the same
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// for the same conversation, which Zen routes and caches by.
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func OpenCodeClient(h http.Header, session string) {
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h.Set("User-Agent", "opencode/"+OpenCodeVersion)
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h.Set("x-opencode-session", openCodeID("ses", session))
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h.Set("x-opencode-request", openCodeID("msg", ""))
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h.Set("x-opencode-client", "cli")
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// OpenCode's project outside a git repository
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h.Set("x-opencode-project", "global")
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}
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// OpenCodeFree says whether model is one of OpenCode Zen's free ones on p,
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// which Zen serves only to what looks like OpenCode: besides the headers
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// OpenCodeClient sets, a streamed request offering tools named bash and
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// read (lowercase, by name alone; checked against Zen, October 2026). The
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// gateway asks them so whoever the client is (gateway/zenfree.go), and the
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// Test button's probe so (zenFreeProbe).
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func (p Provider) OpenCodeFree(model string) bool {
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return p.IsOpenCode() && strings.HasSuffix(model, "-free")
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}
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// OpenCodeTools are the tools Zen's free tier wants offered, by name.
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var OpenCodeTools = []string{"bash", "read"}
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// OpenCodeStub describes a tool offered only for Zen's free tier to see,
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// which the client doesn't have.
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const OpenCodeStub = "Not available in this session. Never call this tool."
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// zenFreeProbe is the Test button's smallest request, body, asked as Zen's
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// free tier wants it: streamed, offering bash and read, which say they
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// aren't to be called.
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func zenFreeProbe(proto Protocol, body string) string {
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var m map[string]any
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if json.Unmarshal([]byte(body), &m) != nil {
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return body
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}
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var tools []any
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for _, n := range OpenCodeTools {
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schema := map[string]any{"type": "object", "properties": map[string]any{}}
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switch proto {
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case Chat:
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tools = append(tools, map[string]any{"type": "function", "function": map[string]any{"name": n, "description": OpenCodeStub, "parameters": schema}})
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case Responses:
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tools = append(tools, map[string]any{"type": "function", "name": n, "description": OpenCodeStub, "parameters": schema})
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default:
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tools = append(tools, map[string]any{"name": n, "description": OpenCodeStub, "input_schema": schema})
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}
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}
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m["stream"], m["tools"] = true, tools
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b, err := json.Marshal(m)
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if err != nil {
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return body
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}
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return string(b)
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}
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var openCodeIDRe = regexp.MustCompile(`^[a-z]{3}_[0-9a-f]{12}[0-9A-Za-z]{14}$`)
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const base62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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// openCodeID is an id as OpenCode makes them (prefix_, 12 hex digits and 14
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// base62 ones): seed's own when it is one with this prefix, else made from
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// seed, or at random when there is none.
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func openCodeID(prefix, seed string) string {
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if strings.HasPrefix(seed, prefix+"_") && openCodeIDRe.MatchString(seed) {
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return seed
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}
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var b [32]byte
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if seed != "" {
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b = sha256.Sum256([]byte(seed))
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} else if _, err := rand.Read(b[:]); err != nil {
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b = sha256.Sum256([]byte(randomUUID()))
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}
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id := []byte(prefix + "_" + hex.EncodeToString(b[:6]))
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for _, c := range b[6:20] {
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id = append(id, base62[int(c)%len(base62)])
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}
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return string(id)
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}
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