1
export type ReceiveCommand = {
2
  oldOid: string;
3
  newOid: string;
4
  ref: string;
5
};
6
 
7
export type ReceiveStatus = {
8
  ref: string;
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  ok: boolean;
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  msg?: string;
11
};
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13
const ZERO_OID_RE = /^0{40}$/i;
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export function isValidRefName(name: string): boolean {
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  if (!name || name === "HEAD") return false;
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  if (!name.startsWith("refs/")) return false;
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  if (/[\x00-\x20~^:?*\[]/.test(name)) return false;
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  if (name.includes("//") || name.startsWith("/") || name.endsWith("/")) return false;
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  if (name.split("/").some((component) => component === "." || component === "..")) return false;
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  if (name.endsWith(".") || name.endsWith(".lock")) return false;
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  if (name.includes("@{")) return false;
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  if (name.includes("\\")) return false;
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  return true;
25
}
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27
export function validateReceiveCommands(
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  currentRefs: Array<{ name: string; oid: string }>,
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  commands: ReceiveCommand[]
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): ReceiveStatus[] {
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  const refMap = new Map(currentRefs.map((ref) => [ref.name, ref.oid] as const));
32
  const statuses: ReceiveStatus[] = [];
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  for (const command of commands) {
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    const current = refMap.get(command.ref);
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    const isZeroOld = ZERO_OID_RE.test(command.oldOid);
37
    const isZeroNew = ZERO_OID_RE.test(command.newOid);
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39
    if (isZeroNew) {
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      if (!current) {
41
        statuses.push({ ref: command.ref, ok: false, msg: "no such ref" });
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        continue;
43
      }
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      if (current.toLowerCase() !== command.oldOid.toLowerCase()) {
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        statuses.push({ ref: command.ref, ok: false, msg: "stale old-oid" });
46
        continue;
47
      }
48
      statuses.push({ ref: command.ref, ok: true });
49
      continue;
50
    }
51
 
52
    if (!current) {
53
      if (!isZeroOld) {
54
        statuses.push({ ref: command.ref, ok: false, msg: "expected zero old-oid" });
55
        continue;
56
      }
57
      statuses.push({ ref: command.ref, ok: true });
58
      continue;
59
    }
60
 
61
    if (current.toLowerCase() !== command.oldOid.toLowerCase()) {
62
      statuses.push({ ref: command.ref, ok: false, msg: "stale old-oid" });
63
      continue;
64
    }
65
 
66
    statuses.push({ ref: command.ref, ok: true });
67
  }
68
 
69
  return statuses;
70
}
71
 
72
export function applyReceiveCommands(
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  currentRefs: Array<{ name: string; oid: string }>,
74
  commands: ReceiveCommand[]
75
): Array<{ name: string; oid: string }> {
76
  const refMap = new Map(currentRefs.map((ref) => [ref.name, ref.oid] as const));
77
  for (const command of commands) {
78
    if (ZERO_OID_RE.test(command.newOid)) {
79
      refMap.delete(command.ref);
80
      continue;
81
    }
82
    refMap.set(command.ref, command.newOid);
83
  }
84
  return Array.from(refMap, ([name, oid]) => ({ name, oid }));
85
}