iOS开发大众点评URL签名生成规则和SHA-1编码

来源：互联网发布：tenga air tech知乎编辑：程序博客网时间：2024/05/09 04:37

URL签名生成规则

所有大众点评API的有效访问URL包括以下三个部分： 1. 资源访问路径，如/v1/deal/find_deals; 2. 请求参数：即API对应所需的参数名和参数值param=value，多个请求参数间用&连接如deal_id=1-85462&appkey=00000； 3. 签名串，由签名算法生成

签名算法如下： 1. 对除appkey以外的所有请求参数进行字典升序排列； 2. 将以上排序后的参数表进行字符串连接，如key1value1key2value2key3value3…keyNvalueN； 3. 将app key作为前缀，将app secret作为后缀，对该字符串进行SHA-1计算，并转换成16进制编码； 4. 转换为全大写形式后即获得签名串

签名串获得后，将其作为sign参数附加到对应的URL中，即可正常访问API。

注意：请保证HTTP请求数据编码务必为UTF-8格式，URL也务必为UTF-8编码格式。

具体调用示例请参见https://github.com/dianping/dianping-open-sdk

+ (NSDictionary *)parseQueryString:(NSString *)query {    NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithCapacity:6];    NSArray *pairs = [query componentsSeparatedByString:@"&"];    for (NSString *pair in pairs) {        NSArray *elements = [pair componentsSeparatedByString:@"="];        if ([elements count] <= 1) {            return nil;        }        NSString *key = [[elements objectAtIndex:0] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];        NSString *val = [[elements objectAtIndex:1] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];        [dict setObject:val forKey:key];    }    return dict;}+ (NSString *)serializeURL:(NSString *)baseURL params:(NSDictionary *)params{    NSURL* parsedURL = [NSURL URLWithString:[baseURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];    NSMutableDictionary *paramsDic = [NSMutableDictionary dictionaryWithDictionary:[self parseQueryString:[parsedURL query]]];    if (params) {        [paramsDic setValuesForKeysWithDictionary:params];    }    NSMutableString *signString = [NSMutableString stringWithString:DIANPING_APP_KEY];    NSMutableString *paramsString = [NSMutableString stringWithFormat:@"appkey=%@", DIANPING_APP_KEY];    NSArray *sortedKeys = [[paramsDic allKeys] sortedArrayUsingSelector: @selector(compare:)];    for (NSString *key in sortedKeys) {        [signString appendFormat:@"%@%@", key, [paramsDic objectForKey:key]];        [paramsString appendFormat:@"&%@=%@", key, [paramsDic objectForKey:key]];    }    [signString appendString:DIANPING_APP_Secret];    unsigned char digest[CC_SHA1_DIGEST_LENGTH];    NSData *stringBytes = [signString dataUsingEncoding: NSUTF8StringEncoding];    if (CC_SHA1([stringBytes bytes], (long)[stringBytes length], digest)) {        /* SHA-1 hash has been calculated and stored in 'digest'. */        NSMutableString *digestString = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH];        for (int i=0; i<CC_SHA1_DIGEST_LENGTH; i++) {            unsigned char aChar = digest[i];            [digestString appendFormat:@"%02X", aChar];        }        [paramsString appendFormat:@"&sign=%@", [digestString uppercaseString]];        return [NSString stringWithFormat:@"%@://%@%@?%@", [parsedURL scheme], [parsedURL host], [parsedURL path], [paramsString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];    } else {        return nil;    }}

直接调用这个方法即可签名成功，+ (NSString )serializeURL:(NSString )baseURL params:(NSDictionary *)params

NSString *url = [LGClient serializeURL:string params:nil];//string是大众点评的需要请求的接口

这个url就可以用来请求大众点评数据了

0 0