Serge Bazanski | cc25bdf | 2018-10-25 14:02:58 +0200 | [diff] [blame] | 1 | package bson |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "encoding/base64" |
| 6 | "fmt" |
| 7 | "strconv" |
| 8 | "strings" |
| 9 | "time" |
| 10 | |
| 11 | "github.com/globalsign/mgo/internal/json" |
| 12 | ) |
| 13 | |
| 14 | // UnmarshalJSON unmarshals a JSON value that may hold non-standard |
| 15 | // syntax as defined in BSON's extended JSON specification. |
| 16 | func UnmarshalJSON(data []byte, value interface{}) error { |
| 17 | d := json.NewDecoder(bytes.NewBuffer(data)) |
| 18 | d.Extend(&jsonExt) |
| 19 | return d.Decode(value) |
| 20 | } |
| 21 | |
| 22 | // MarshalJSON marshals a JSON value that may hold non-standard |
| 23 | // syntax as defined in BSON's extended JSON specification. |
| 24 | func MarshalJSON(value interface{}) ([]byte, error) { |
| 25 | var buf bytes.Buffer |
| 26 | e := json.NewEncoder(&buf) |
| 27 | e.Extend(&jsonExt) |
| 28 | err := e.Encode(value) |
| 29 | if err != nil { |
| 30 | return nil, err |
| 31 | } |
| 32 | return buf.Bytes(), nil |
| 33 | } |
| 34 | |
| 35 | // jdec is used internally by the JSON decoding functions |
| 36 | // so they may unmarshal functions without getting into endless |
| 37 | // recursion due to keyed objects. |
| 38 | func jdec(data []byte, value interface{}) error { |
| 39 | d := json.NewDecoder(bytes.NewBuffer(data)) |
| 40 | d.Extend(&funcExt) |
| 41 | return d.Decode(value) |
| 42 | } |
| 43 | |
| 44 | var jsonExt json.Extension |
| 45 | var funcExt json.Extension |
| 46 | |
| 47 | // TODO |
| 48 | // - Shell regular expressions ("/regexp/opts") |
| 49 | |
| 50 | func init() { |
| 51 | jsonExt.DecodeUnquotedKeys(true) |
| 52 | jsonExt.DecodeTrailingCommas(true) |
| 53 | |
| 54 | funcExt.DecodeFunc("BinData", "$binaryFunc", "$type", "$binary") |
| 55 | jsonExt.DecodeKeyed("$binary", jdecBinary) |
| 56 | jsonExt.DecodeKeyed("$binaryFunc", jdecBinary) |
| 57 | jsonExt.EncodeType([]byte(nil), jencBinarySlice) |
| 58 | jsonExt.EncodeType(Binary{}, jencBinaryType) |
| 59 | |
| 60 | funcExt.DecodeFunc("ISODate", "$dateFunc", "S") |
| 61 | funcExt.DecodeFunc("new Date", "$dateFunc", "S") |
| 62 | jsonExt.DecodeKeyed("$date", jdecDate) |
| 63 | jsonExt.DecodeKeyed("$dateFunc", jdecDate) |
| 64 | jsonExt.EncodeType(time.Time{}, jencDate) |
| 65 | |
| 66 | funcExt.DecodeFunc("Timestamp", "$timestamp", "t", "i") |
| 67 | jsonExt.DecodeKeyed("$timestamp", jdecTimestamp) |
| 68 | jsonExt.EncodeType(MongoTimestamp(0), jencTimestamp) |
| 69 | |
| 70 | funcExt.DecodeConst("undefined", Undefined) |
| 71 | |
| 72 | jsonExt.DecodeKeyed("$regex", jdecRegEx) |
| 73 | jsonExt.EncodeType(RegEx{}, jencRegEx) |
| 74 | |
| 75 | funcExt.DecodeFunc("ObjectId", "$oidFunc", "Id") |
| 76 | jsonExt.DecodeKeyed("$oid", jdecObjectId) |
| 77 | jsonExt.DecodeKeyed("$oidFunc", jdecObjectId) |
| 78 | jsonExt.EncodeType(ObjectId(""), jencObjectId) |
| 79 | |
| 80 | funcExt.DecodeFunc("DBRef", "$dbrefFunc", "$ref", "$id") |
| 81 | jsonExt.DecodeKeyed("$dbrefFunc", jdecDBRef) |
| 82 | |
| 83 | funcExt.DecodeFunc("NumberLong", "$numberLongFunc", "N") |
| 84 | jsonExt.DecodeKeyed("$numberLong", jdecNumberLong) |
| 85 | jsonExt.DecodeKeyed("$numberLongFunc", jdecNumberLong) |
| 86 | jsonExt.EncodeType(int64(0), jencNumberLong) |
| 87 | jsonExt.EncodeType(int(0), jencInt) |
| 88 | |
| 89 | funcExt.DecodeConst("MinKey", MinKey) |
| 90 | funcExt.DecodeConst("MaxKey", MaxKey) |
| 91 | jsonExt.DecodeKeyed("$minKey", jdecMinKey) |
| 92 | jsonExt.DecodeKeyed("$maxKey", jdecMaxKey) |
| 93 | jsonExt.EncodeType(orderKey(0), jencMinMaxKey) |
| 94 | |
| 95 | jsonExt.DecodeKeyed("$undefined", jdecUndefined) |
| 96 | jsonExt.EncodeType(Undefined, jencUndefined) |
| 97 | |
| 98 | jsonExt.Extend(&funcExt) |
| 99 | } |
| 100 | |
| 101 | func fbytes(format string, args ...interface{}) []byte { |
| 102 | var buf bytes.Buffer |
| 103 | fmt.Fprintf(&buf, format, args...) |
| 104 | return buf.Bytes() |
| 105 | } |
| 106 | |
| 107 | func jdecBinary(data []byte) (interface{}, error) { |
| 108 | var v struct { |
| 109 | Binary []byte `json:"$binary"` |
| 110 | Type string `json:"$type"` |
| 111 | Func struct { |
| 112 | Binary []byte `json:"$binary"` |
| 113 | Type int64 `json:"$type"` |
| 114 | } `json:"$binaryFunc"` |
| 115 | } |
| 116 | err := jdec(data, &v) |
| 117 | if err != nil { |
| 118 | return nil, err |
| 119 | } |
| 120 | |
| 121 | var binData []byte |
| 122 | var binKind int64 |
| 123 | if v.Type == "" && v.Binary == nil { |
| 124 | binData = v.Func.Binary |
| 125 | binKind = v.Func.Type |
| 126 | } else if v.Type == "" { |
| 127 | return v.Binary, nil |
| 128 | } else { |
| 129 | binData = v.Binary |
| 130 | binKind, err = strconv.ParseInt(v.Type, 0, 64) |
| 131 | if err != nil { |
| 132 | binKind = -1 |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | if binKind == 0 { |
| 137 | return binData, nil |
| 138 | } |
| 139 | if binKind < 0 || binKind > 255 { |
| 140 | return nil, fmt.Errorf("invalid type in binary object: %s", data) |
| 141 | } |
| 142 | |
| 143 | return Binary{Kind: byte(binKind), Data: binData}, nil |
| 144 | } |
| 145 | |
| 146 | func jencBinarySlice(v interface{}) ([]byte, error) { |
| 147 | in := v.([]byte) |
| 148 | out := make([]byte, base64.StdEncoding.EncodedLen(len(in))) |
| 149 | base64.StdEncoding.Encode(out, in) |
| 150 | return fbytes(`{"$binary":"%s","$type":"0x0"}`, out), nil |
| 151 | } |
| 152 | |
| 153 | func jencBinaryType(v interface{}) ([]byte, error) { |
| 154 | in := v.(Binary) |
| 155 | out := make([]byte, base64.StdEncoding.EncodedLen(len(in.Data))) |
| 156 | base64.StdEncoding.Encode(out, in.Data) |
| 157 | return fbytes(`{"$binary":"%s","$type":"0x%x"}`, out, in.Kind), nil |
| 158 | } |
| 159 | |
| 160 | const jdateFormat = "2006-01-02T15:04:05.999Z07:00" |
| 161 | |
| 162 | func jdecDate(data []byte) (interface{}, error) { |
| 163 | var v struct { |
| 164 | S string `json:"$date"` |
| 165 | Func struct { |
| 166 | S string |
| 167 | } `json:"$dateFunc"` |
| 168 | } |
| 169 | _ = jdec(data, &v) |
| 170 | if v.S == "" { |
| 171 | v.S = v.Func.S |
| 172 | } |
| 173 | if v.S != "" { |
| 174 | var errs []string |
| 175 | for _, format := range []string{jdateFormat, "2006-01-02"} { |
| 176 | t, err := time.Parse(format, v.S) |
| 177 | if err == nil { |
| 178 | return t, nil |
| 179 | } |
| 180 | errs = append(errs, err.Error()) |
| 181 | } |
| 182 | return nil, fmt.Errorf("cannot parse date: %q [%s]", v.S, strings.Join(errs, ", ")) |
| 183 | } |
| 184 | |
| 185 | var vn struct { |
| 186 | Date struct { |
| 187 | N int64 `json:"$numberLong,string"` |
| 188 | } `json:"$date"` |
| 189 | Func struct { |
| 190 | S int64 |
| 191 | } `json:"$dateFunc"` |
| 192 | } |
| 193 | err := jdec(data, &vn) |
| 194 | if err != nil { |
| 195 | return nil, fmt.Errorf("cannot parse date: %q", data) |
| 196 | } |
| 197 | n := vn.Date.N |
| 198 | if n == 0 { |
| 199 | n = vn.Func.S |
| 200 | } |
| 201 | return time.Unix(n/1000, n%1000*1e6).UTC(), nil |
| 202 | } |
| 203 | |
| 204 | func jencDate(v interface{}) ([]byte, error) { |
| 205 | t := v.(time.Time) |
| 206 | return fbytes(`{"$date":%q}`, t.Format(jdateFormat)), nil |
| 207 | } |
| 208 | |
| 209 | func jdecTimestamp(data []byte) (interface{}, error) { |
| 210 | var v struct { |
| 211 | Func struct { |
| 212 | T int32 `json:"t"` |
| 213 | I int32 `json:"i"` |
| 214 | } `json:"$timestamp"` |
| 215 | } |
| 216 | err := jdec(data, &v) |
| 217 | if err != nil { |
| 218 | return nil, err |
| 219 | } |
| 220 | return MongoTimestamp(uint64(v.Func.T)<<32 | uint64(uint32(v.Func.I))), nil |
| 221 | } |
| 222 | |
| 223 | func jencTimestamp(v interface{}) ([]byte, error) { |
| 224 | ts := uint64(v.(MongoTimestamp)) |
| 225 | return fbytes(`{"$timestamp":{"t":%d,"i":%d}}`, ts>>32, uint32(ts)), nil |
| 226 | } |
| 227 | |
| 228 | func jdecRegEx(data []byte) (interface{}, error) { |
| 229 | var v struct { |
| 230 | Regex string `json:"$regex"` |
| 231 | Options string `json:"$options"` |
| 232 | } |
| 233 | err := jdec(data, &v) |
| 234 | if err != nil { |
| 235 | return nil, err |
| 236 | } |
| 237 | return RegEx{v.Regex, v.Options}, nil |
| 238 | } |
| 239 | |
| 240 | func jencRegEx(v interface{}) ([]byte, error) { |
| 241 | re := v.(RegEx) |
| 242 | type regex struct { |
| 243 | Regex string `json:"$regex"` |
| 244 | Options string `json:"$options"` |
| 245 | } |
| 246 | return json.Marshal(regex{re.Pattern, re.Options}) |
| 247 | } |
| 248 | |
| 249 | func jdecObjectId(data []byte) (interface{}, error) { |
| 250 | var v struct { |
| 251 | Id string `json:"$oid"` |
| 252 | Func struct { |
| 253 | Id string |
| 254 | } `json:"$oidFunc"` |
| 255 | } |
| 256 | err := jdec(data, &v) |
| 257 | if err != nil { |
| 258 | return nil, err |
| 259 | } |
| 260 | if v.Id == "" { |
| 261 | v.Id = v.Func.Id |
| 262 | } |
| 263 | return ObjectIdHex(v.Id), nil |
| 264 | } |
| 265 | |
| 266 | func jencObjectId(v interface{}) ([]byte, error) { |
| 267 | return fbytes(`{"$oid":"%s"}`, v.(ObjectId).Hex()), nil |
| 268 | } |
| 269 | |
| 270 | func jdecDBRef(data []byte) (interface{}, error) { |
| 271 | // TODO Support unmarshaling $ref and $id into the input value. |
| 272 | var v struct { |
| 273 | Obj map[string]interface{} `json:"$dbrefFunc"` |
| 274 | } |
| 275 | // TODO Fix this. Must not be required. |
| 276 | v.Obj = make(map[string]interface{}) |
| 277 | err := jdec(data, &v) |
| 278 | if err != nil { |
| 279 | return nil, err |
| 280 | } |
| 281 | return v.Obj, nil |
| 282 | } |
| 283 | |
| 284 | func jdecNumberLong(data []byte) (interface{}, error) { |
| 285 | var v struct { |
| 286 | N int64 `json:"$numberLong,string"` |
| 287 | Func struct { |
| 288 | N int64 `json:",string"` |
| 289 | } `json:"$numberLongFunc"` |
| 290 | } |
| 291 | var vn struct { |
| 292 | N int64 `json:"$numberLong"` |
| 293 | Func struct { |
| 294 | N int64 |
| 295 | } `json:"$numberLongFunc"` |
| 296 | } |
| 297 | err := jdec(data, &v) |
| 298 | if err != nil { |
| 299 | err = jdec(data, &vn) |
| 300 | v.N = vn.N |
| 301 | v.Func.N = vn.Func.N |
| 302 | } |
| 303 | if err != nil { |
| 304 | return nil, err |
| 305 | } |
| 306 | if v.N != 0 { |
| 307 | return v.N, nil |
| 308 | } |
| 309 | return v.Func.N, nil |
| 310 | } |
| 311 | |
| 312 | func jencNumberLong(v interface{}) ([]byte, error) { |
| 313 | n := v.(int64) |
| 314 | f := `{"$numberLong":"%d"}` |
| 315 | if n <= 1<<53 { |
| 316 | f = `{"$numberLong":%d}` |
| 317 | } |
| 318 | return fbytes(f, n), nil |
| 319 | } |
| 320 | |
| 321 | func jencInt(v interface{}) ([]byte, error) { |
| 322 | n := v.(int) |
| 323 | f := `{"$numberLong":"%d"}` |
| 324 | if int64(n) <= 1<<53 { |
| 325 | f = `%d` |
| 326 | } |
| 327 | return fbytes(f, n), nil |
| 328 | } |
| 329 | |
| 330 | func jdecMinKey(data []byte) (interface{}, error) { |
| 331 | var v struct { |
| 332 | N int64 `json:"$minKey"` |
| 333 | } |
| 334 | err := jdec(data, &v) |
| 335 | if err != nil { |
| 336 | return nil, err |
| 337 | } |
| 338 | if v.N != 1 { |
| 339 | return nil, fmt.Errorf("invalid $minKey object: %s", data) |
| 340 | } |
| 341 | return MinKey, nil |
| 342 | } |
| 343 | |
| 344 | func jdecMaxKey(data []byte) (interface{}, error) { |
| 345 | var v struct { |
| 346 | N int64 `json:"$maxKey"` |
| 347 | } |
| 348 | err := jdec(data, &v) |
| 349 | if err != nil { |
| 350 | return nil, err |
| 351 | } |
| 352 | if v.N != 1 { |
| 353 | return nil, fmt.Errorf("invalid $maxKey object: %s", data) |
| 354 | } |
| 355 | return MaxKey, nil |
| 356 | } |
| 357 | |
| 358 | func jencMinMaxKey(v interface{}) ([]byte, error) { |
| 359 | switch v.(orderKey) { |
| 360 | case MinKey: |
| 361 | return []byte(`{"$minKey":1}`), nil |
| 362 | case MaxKey: |
| 363 | return []byte(`{"$maxKey":1}`), nil |
| 364 | } |
| 365 | panic(fmt.Sprintf("invalid $minKey/$maxKey value: %d", v)) |
| 366 | } |
| 367 | |
| 368 | func jdecUndefined(data []byte) (interface{}, error) { |
| 369 | var v struct { |
| 370 | B bool `json:"$undefined"` |
| 371 | } |
| 372 | err := jdec(data, &v) |
| 373 | if err != nil { |
| 374 | return nil, err |
| 375 | } |
| 376 | if !v.B { |
| 377 | return nil, fmt.Errorf("invalid $undefined object: %s", data) |
| 378 | } |
| 379 | return Undefined, nil |
| 380 | } |
| 381 | |
| 382 | func jencUndefined(v interface{}) ([]byte, error) { |
| 383 | return []byte(`{"$undefined":true}`), nil |
| 384 | } |