| 1 | package hostops |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "io" |
| 7 | "os" |
| 8 | "strings" |
| 9 | |
| 10 | "github.com/carlosframework/platform/internal/hostclaim" |
| 11 | "github.com/carlosframework/platform/internal/lease" |
| 12 | "github.com/carlosframework/platform/internal/release" |
| 13 | ) |
| 14 | |
| 15 | // versionedBoundary guards the console's exact-version handle (DBVersions). |
| 16 | // Reads keep their values and errors. CopyVersion, DeleteVersion and |
| 17 | // PutIfAbsent are classified: the control bucket by the bucket classifier, |
| 18 | // data buckets by the claim holder of instances/<host>/ or moves/<host>/. |
| 19 | // Named private fields; never embeds lease.VersionedStore. |
| 20 | type versionedBoundary struct { |
| 21 | raw lease.VersionedStore |
| 22 | control release.Store // raw control store, read-only use |
| 23 | writer *ControlWriter |
| 24 | bucket string // the control (deployment) bucket |
| 25 | data map[string]bool |
| 26 | observe func(MutationEvent) |
| 27 | } |
| 28 | |
| 29 | var ( |
| 30 | _ lease.VersionedStore = (*versionedBoundary)(nil) |
| 31 | _ lease.VersionRangeOpener = (*versionedBoundary)(nil) |
| 32 | ) |
| 33 | |
| 34 | func NewVersionedBoundary(enabled bool, raw lease.VersionedStore, control release.Store, writer *ControlWriter, controlBucket string, dataBuckets []string, observe func(MutationEvent)) (lease.VersionedStore, error) { |
| 35 | if !enabled { |
| 36 | return raw, nil |
| 37 | } |
| 38 | if raw == nil || control == nil || writer == nil || controlBucket == "" { |
| 39 | return nil, ErrContract |
| 40 | } |
| 41 | data := map[string]bool{} |
| 42 | for _, b := range dataBuckets { |
| 43 | if b == "" || b == controlBucket { |
| 44 | return nil, ErrContract |
| 45 | } |
| 46 | data[b] = true |
| 47 | } |
| 48 | return &versionedBoundary{raw: raw, control: control, writer: writer, bucket: controlBucket, data: data, observe: observe}, nil |
| 49 | } |
| 50 | |
| 51 | func (v *versionedBoundary) ListVersions(ctx context.Context, bucket, prefix string) ([]lease.ObjectVersion, error) { |
| 52 | return v.raw.ListVersions(ctx, bucket, prefix) |
| 53 | } |
| 54 | func (v *versionedBoundary) OpenVersion(ctx context.Context, bucket, key, versionID string) (io.ReadCloser, error) { |
| 55 | return v.raw.OpenVersion(ctx, bucket, key, versionID) |
| 56 | } |
| 57 | func (v *versionedBoundary) GetVersion(ctx context.Context, bucket, key, versionID string) ([]byte, error) { |
| 58 | return v.raw.GetVersion(ctx, bucket, key, versionID) |
| 59 | } |
| 60 | func (v *versionedBoundary) OpenVersionRange(ctx context.Context, bucket, key, versionID string, offset, length int64) (io.ReadCloser, error) { |
| 61 | if r, ok := v.raw.(lease.VersionRangeOpener); ok { |
| 62 | return r.OpenVersionRange(ctx, bucket, key, versionID, offset, length) |
| 63 | } |
| 64 | return nil, ErrContract |
| 65 | } |
| 66 | |
| 67 | func (v *versionedBoundary) authorize(ctx context.Context, method, bucket, key string, before, after []byte) error { |
| 68 | t := MutationTarget{Surface: "versioned:" + bucket, Method: method, Key: key, Before: before, After: after} |
| 69 | err := v.classify(ctx, bucket, t) |
| 70 | if v.observe != nil { |
| 71 | v.observe(MutationEvent{Target: t, Verdict: err}) |
| 72 | } |
| 73 | return err |
| 74 | } |
| 75 | |
| 76 | func (v *versionedBoundary) classify(ctx context.Context, bucket string, t MutationTarget) error { |
| 77 | switch { |
| 78 | case bucket == v.bucket: |
| 79 | if provisioningKey(t.Key) && t.Method != "CopyVersion:source" { |
| 80 | // Version replacement/deletion can resurrect a lower counter. |
| 81 | // Only the typed retired-record sweep may remove old versions. |
| 82 | key, _ := ctx.Value(retiredRecordSweepKey{}).(string) |
| 83 | if t.Method != "DeleteVersion" || key != t.Key { |
| 84 | return ErrContract |
| 85 | } |
| 86 | if _, _, err := v.control.Get(ctx, t.Key); !errors.Is(err, os.ErrNotExist) { |
| 87 | if err != nil { |
| 88 | return err |
| 89 | } |
| 90 | return ErrPending |
| 91 | } |
| 92 | } |
| 93 | if err := structuralRefusal(t.Key); err != nil { |
| 94 | return err |
| 95 | } |
| 96 | c, err := ClassifyMutation(ctx, v.control, v.writer, t) |
| 97 | if err != nil { |
| 98 | return err |
| 99 | } |
| 100 | if c.NonApp != "" && len(c.Scopes) == 0 && strings.HasPrefix(c.Family, "lifecycle") { |
| 101 | // Lifecycle roots are never rewritten by exact-version calls. |
| 102 | return ErrIdentity |
| 103 | } |
| 104 | return AuthorizeScopes(ctx, v.control, v.writer, c) |
| 105 | case v.data[bucket]: |
| 106 | host := "" |
| 107 | for _, root := range []string{"instances/", "moves/"} { |
| 108 | if rest, ok := strings.CutPrefix(t.Key, root); ok { |
| 109 | host, _, _ = strings.Cut(rest, "/") |
| 110 | } |
| 111 | } |
| 112 | if host == "" { |
| 113 | return ErrUnclassified |
| 114 | } |
| 115 | obs, err := hostclaim.Read(ctx, v.control, host) |
| 116 | if err != nil { |
| 117 | return err |
| 118 | } |
| 119 | if obs.Absent || obs.Claim.Holder == nil { |
| 120 | return ErrPending |
| 121 | } |
| 122 | h := obs.Claim.Holder |
| 123 | return AuthorizeScopes(ctx, v.control, v.writer, Classification{Family: "data-bucket", Scopes: []AppScope{{h.Account, h.App}}}) |
| 124 | } |
| 125 | return ErrUnclassified |
| 126 | } |
| 127 | |
| 128 | func (v *versionedBoundary) versionBody(ctx context.Context, bucket, key, versionID string) []byte { |
| 129 | if bucket != v.bucket { |
| 130 | return nil |
| 131 | } |
| 132 | b, err := v.raw.GetVersion(ctx, bucket, key, versionID) |
| 133 | if err != nil { |
| 134 | return nil |
| 135 | } |
| 136 | return b |
| 137 | } |
| 138 | |
| 139 | // CopyVersion authorizes both the source (its bytes move into another |
| 140 | // scope) and the destination. |
| 141 | func (v *versionedBoundary) CopyVersion(ctx context.Context, srcBucket, srcKey, srcVersionID, dstBucket, dstKey string, createOnly bool) (string, string, error) { |
| 142 | body := v.versionBody(ctx, srcBucket, srcKey, srcVersionID) |
| 143 | if err := v.authorize(ctx, "CopyVersion:source", srcBucket, srcKey, body, nil); err != nil { |
| 144 | return "", "", err |
| 145 | } |
| 146 | if err := v.authorize(ctx, "CopyVersion", dstBucket, dstKey, nil, body); err != nil { |
| 147 | return "", "", err |
| 148 | } |
| 149 | MarkAppMutationIssued(ctx) |
| 150 | return v.raw.CopyVersion(ctx, srcBucket, srcKey, srcVersionID, dstBucket, dstKey, createOnly) |
| 151 | } |
| 152 | |
| 153 | func (v *versionedBoundary) DeleteVersion(ctx context.Context, bucket, key, versionID string) error { |
| 154 | if versionID == "" { |
| 155 | return lease.ErrNoVersionID |
| 156 | } |
| 157 | if err := v.authorize(ctx, "DeleteVersion", bucket, key, v.versionBody(ctx, bucket, key, versionID), nil); err != nil { |
| 158 | return err |
| 159 | } |
| 160 | if bucket == v.bucket && provisioningKey(key) { |
| 161 | if err := retiredRecordVersion(ctx, v.control, v.raw, bucket, key, versionID); err != nil { |
| 162 | return err |
| 163 | } |
| 164 | } |
| 165 | MarkAppMutationIssued(ctx) |
| 166 | return v.raw.DeleteVersion(ctx, bucket, key, versionID) |
| 167 | } |
| 168 | |
| 169 | func (v *versionedBoundary) PutIfAbsent(ctx context.Context, bucket, key string, body []byte) (string, error) { |
| 170 | if err := v.authorize(ctx, "Put", bucket, key, nil, body); err != nil { |
| 171 | return "", err |
| 172 | } |
| 173 | MarkAppMutationIssued(ctx) |
| 174 | return v.raw.PutIfAbsent(ctx, bucket, key, body) |
| 175 | } |
| 176 | |
amadan