{"id":9824,"date":"2023-03-03T13:12:24","date_gmt":"2023-03-03T09:42:24","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/best-practices-for-building-a-validation-layer-in-go-59j9\/"},"modified":"2023-03-03T13:12:24","modified_gmt":"2023-03-03T09:42:24","slug":"best-practices-for-building-a-validation-layer-in-go-59j9","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/best-practices-for-building-a-validation-layer-in-go-59j9\/","title":{"rendered":"\u0628\u0647\u062a\u0631\u06cc\u0646 \u0631\u0648\u0634 \u0647\u0627 \u0628\u0631\u0627\u06cc \u0633\u0627\u062e\u062a \u06cc\u06a9 \u0644\u0627\u06cc\u0647 \u0627\u0639\u062a\u0628\u0627\u0631 \u0633\u0646\u062c\u06cc \u062f\u0631 Go"},"content":{"rendered":"
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\n
package<\/span> validation<\/span>\n\nimport<\/span> (<\/span>\n    \"errors\"<\/span>\n    \"fmt\"<\/span>\n)<\/span>\n\ntype<\/span> Rule<\/span> func<\/span>(<\/span>key<\/span> string<\/span>,<\/span> value<\/span> interface<\/span>{})<\/span> error<\/span>\n\ntype<\/span> Rules<\/span> []<\/span>Rule<\/span>\n\ntype<\/span> Validator<\/span> struct<\/span> {<\/span>\n    rules<\/span> Rules<\/span>\n}<\/span>\n\nfunc<\/span> (<\/span>v<\/span> *<\/span>Validator<\/span>)<\/span> Add<\/span>(<\/span>rule<\/span> Rule<\/span>)<\/span> {<\/span>\n    v<\/span>.<\/span>rules<\/span> =<\/span> append<\/span>(<\/span>v<\/span>.<\/span>rules<\/span>,<\/span> rule<\/span>)<\/span>\n}<\/span>\n\nfunc<\/span> (<\/span>v<\/span> *<\/span>Validator<\/span>)<\/span> Validate<\/span>(<\/span>data<\/span> map<\/span>[<\/span>string<\/span>]<\/span>interface<\/span>{})<\/span> []<\/span>error<\/span> {<\/span>\n    var<\/span> errors<\/span> []<\/span>error<\/span>\n    for<\/span> _<\/span>,<\/span> rule<\/span> :=<\/span> range<\/span> v<\/span>.<\/span>rules<\/span> {<\/span>\n        for<\/span> key<\/span>,<\/span> value<\/span> :=<\/span> range<\/span> data<\/span> {<\/span>\n            if<\/span> err<\/span> :=<\/span> rule<\/span>(<\/span>key<\/span>,<\/span> value<\/span>);<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\n                errors<\/span> =<\/span> append<\/span>(<\/span>errors<\/span>,<\/span> err<\/span>)<\/span>\n            }<\/span>\n        }<\/span>\n    }<\/span>\n    return<\/span> errors<\/span>\n}<\/span>\n\nfunc<\/span> ValidateLength<\/span>(<\/span>maxLength<\/span> int<\/span>)<\/span> Rule<\/span> {<\/span>\n    return<\/span> func<\/span>(<\/span>key<\/span> string<\/span>,<\/span> value<\/span> interface<\/span>{})<\/span> error<\/span> {<\/span>\n        str<\/span>,<\/span> ok<\/span> :=<\/span> value<\/span>.<\/span>(<\/span>string<\/span>)<\/span>\n        if<\/span> !<\/span>ok<\/span> {<\/span>\n            return<\/span> fmt<\/span>.<\/span>Errorf<\/span>(<\/span>\"%s is not a string\"<\/span>,<\/span> key<\/span>)<\/span>\n        }<\/span>\n        if<\/span> len<\/span>(<\/span>str<\/span>)<\/span> ><\/span> maxLength<\/span> {<\/span>\n            return<\/span> fmt<\/span>.<\/span>Errorf<\/span>(<\/span>\"%s must be less than or equal to %d characters\"<\/span>,<\/span> key<\/span>,<\/span> maxLength<\/span>)<\/span>\n        }<\/span>\n        return<\/span> nil<\/span>\n    }<\/span>\n}<\/span>\n\nfunc<\/span> ValidatePresence<\/span>(<\/span>key<\/span> string<\/span>,<\/span> value<\/span> interface<\/span>{})<\/span> error<\/span> {<\/span>\n    if<\/span> value<\/span> ==<\/span> \"\"<\/span> {<\/span>\n        return<\/span> fmt<\/span>.<\/span>Errorf<\/span>(<\/span>\"%s can't be blank\"<\/span>,<\/span> key<\/span>)<\/span>\n    }<\/span>\n    return<\/span> nil<\/span>\n}<\/span>\n\nfunc<\/span> ValidateRange<\/span>(<\/span>min<\/span>,<\/span> max<\/span> int<\/span>)<\/span> Rule<\/span> {<\/span>\n    return<\/span> func<\/span>(<\/span>key<\/span> string<\/span>,<\/span> value<\/span> interface<\/span>{})<\/span> error<\/span> {<\/span>\n        num<\/span>,<\/span> ok<\/span> :=<\/span> value<\/span>.<\/span>(<\/span>int<\/span>)<\/span>\n        if<\/span> !<\/span>ok<\/span> {<\/span>\n            return<\/span> fmt<\/span>.<\/span>Errorf<\/span>(<\/span>\"%s is not a number\"<\/span>,<\/span> key<\/span>)<\/span>\n        }<\/span>\n        if<\/span> num<\/span> <<\/span> min<\/span> ||<\/span> num<\/span> ><\/span> max<\/span> {<\/span>\n            return<\/span> fmt<\/span>.<\/span>Errorf<\/span>(<\/span>\"%s must be between %d and %d\"<\/span>,<\/span> key<\/span>,<\/span> min<\/span>,<\/span> max<\/span>)<\/span>\n        }<\/span>\n        return<\/span> nil<\/span>\n    }<\/span>\n}<\/span>\n\nfunc<\/span> ValidateEmail<\/span>(<\/span>key<\/span> string<\/span>,<\/span> value<\/span> interface<\/span>{})<\/span> error<\/span> {<\/span>\n    str<\/span>,<\/span> ok<\/span> :=<\/span> value<\/span>.<\/span>(<\/span>string<\/span>)<\/span>\n    if<\/span> !<\/span>ok<\/span> {<\/span>\n        return<\/span> fmt<\/span>.<\/span>Errorf<\/span>(<\/span>\"%s is not a string\"<\/span>,<\/span> key<\/span>)<\/span>\n    }<\/span>\n    \/\/ simplified email validation for example purposes<\/span>\n    if<\/span> str<\/span> ==<\/span> \"\"<\/span> ||<\/span> str<\/span>[<\/span>:<\/span>1<\/span>]<\/span> ==<\/span> \"@\"<\/span> ||<\/span> str<\/span>[<\/span>len<\/span>(<\/span>str<\/span>)<\/span>-<\/span>1<\/span>:<\/span>]<\/span> ==<\/span> \"@\"<\/span> {<\/span>\n        return<\/span> fmt<\/span>.<\/span>Errorf<\/span>(<\/span>\"%s is not a valid email address\"<\/span>,<\/span> key<\/span>)<\/span>\n    }<\/span>\n    return<\/span> nil<\/span>\n}<\/span>\n<\/code><\/pre>\n
\n
\n    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n
    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n
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\u0646\u0648\u0639 Rules \u0628\u0631\u0634\u06cc \u0627\u0632 \u0627\u0646\u0648\u0627\u0639 Rule \u0627\u0633\u062a \u06a9\u0647 \u0645\u062c\u0645\u0648\u0639\u0647 \u0627\u06cc \u0627\u0632 \u0642\u0648\u0627\u0646\u06cc\u0646 \u0627\u0639\u062a\u0628\u0627\u0631 \u0633\u0646\u062c\u06cc \u0631\u0627 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f.<\/p>\n
\u0646\u0648\u0639 Validator \u0634\u0627\u0645\u0644 \u0644\u06cc\u0633\u062a\u06cc \u0627\u0632 \u0642\u0648\u0627\u0646\u06cc\u0646 \u0627\u0633\u062a \u0648 \u062f\u0627\u0631\u0627\u06cc \u0631\u0648\u0634 \u0647\u0627\u06cc\u06cc \u0628\u0631\u0627\u06cc \u0627\u0641\u0632\u0648\u062f\u0646 \u0642\u0648\u0627\u0646\u06cc\u0646 \u062c\u062f\u06cc\u062f \u0648 \u0627\u0639\u062a\u0628\u0627\u0631\u0633\u0646\u062c\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627 \u062f\u0631 \u0628\u0631\u0627\u0628\u0631 \u062a\u0645\u0627\u0645 \u0642\u0648\u0627\u0646\u06cc\u0646 \u0645\u0648\u062c\u0648\u062f \u062f\u0631 \u0644\u06cc\u0633\u062a \u0627\u0633\u062a.<\/p>\n
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\u0645\u062a\u062f Validate \u0646\u0642\u0634\u0647 \u0627\u06cc \u0627\u0632 \u062c\u0641\u062a \u0647\u0627\u06cc \u06a9\u0644\u06cc\u062f-\u0645\u0642\u062f\u0627\u0631 \u0631\u0627 \u0645\u06cc \u06af\u06cc\u0631\u062f \u0648 \u0644\u06cc\u0633\u062a\u06cc \u0627\u0632 \u062e\u0637\u0627\u0647\u0627\u06cc \u06cc\u0627\u0641\u062a \u0634\u062f\u0647 \u062f\u0631 \u0637\u0648\u0644 \u0641\u0631\u0622\u06cc\u0646\u062f \u0627\u0639\u062a\u0628\u0627\u0631 \u0633\u0646\u062c\u06cc \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f.<\/p>\n
\u062a\u0648\u0627\u0628\u0639 ValidateLength\u060c ValidatePresence\u060c ValidateRange \u0648 ValidateEmail \u0646\u0645\u0648\u0646\u0647 \u0647\u0627\u06cc\u06cc \u0627\u0632 \u0642\u0648\u0627\u0646\u06cc\u0646 \u0627\u0632 \u067e\u06cc\u0634 \u062a\u0639\u0631\u06cc\u0641 \u0634\u062f\u0647 \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u0622\u0646\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f.  \u0627\u06cc\u0646 \u062a\u0648\u0627\u0628\u0639 \u06cc\u06a9 \u0646\u0648\u0639 Rule \u0631\u0627 \u0628\u0631\u0645\u06cc\u200c\u06af\u0631\u062f\u0627\u0646\u0646\u062f \u06a9\u0647 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u062f \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0645\u062a\u062f Add \u0628\u0647 \u06cc\u06a9 \u0646\u0645\u0648\u0646\u0647 Validator \u0627\u0636\u0627\u0641\u0647 \u06a9\u0646\u06cc\u062f.<\/p>\n
\u0627\u06a9\u0646\u0648\u0646 \u06a9\u0647 \u0644\u0627\u06cc\u0647 \u0627\u0639\u062a\u0628\u0627\u0631 \u0633\u0646\u062c\u06cc \u062e\u0648\u062f \u0631\u0627 \u0622\u0645\u0627\u062f\u0647 \u06a9\u0631\u062f\u0647 \u0627\u06cc\u0645\u060c \u0628\u06cc\u0627\u06cc\u06cc\u062f \u0628\u0628\u06cc\u0646\u06cc\u0645 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u0632 \u0622\u0646 \u0628\u0631\u0627\u06cc \u062a\u0623\u06cc\u06cc\u062f \u0627\u0639\u062a\u0628\u0627\u0631 \u0628\u062f\u0646\u0647 \u062f\u0631\u062e\u0648\u0627\u0633\u062a \u06cc\u06a9 \u0646\u0642\u0637\u0647 \u067e\u0627\u06cc\u0627\u0646\u06cc API \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645.  \u0645\u0627 \u06cc\u06a9 \u06a9\u0646\u062a\u0631\u0644\u200c\u06a9\u0646\u0646\u062f\u0647 \u0633\u0627\u062f\u0647 HTTP \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645 \u06a9\u0647 \u0628\u062f\u0646\u0647 \u062f\u0631\u062e\u0648\u0627\u0633\u062a JSON \u0631\u0627 \u0645\u06cc\u200c\u067e\u0630\u06cc\u0631\u062f \u0648 \u0622\u0646 \u0631\u0627 \u062f\u0631 \u0628\u0631\u0627\u0628\u0631 \u0645\u062c\u0645\u0648\u0639\u0647\u200c\u0627\u06cc \u0627\u0632 \u0642\u0648\u0627\u0646\u06cc\u0646 \u0627\u0639\u062a\u0628\u0627\u0631\u0633\u0646\u062c\u06cc \u062a\u0623\u06cc\u06cc\u062f \u0645\u06cc\u200c\u06a9\u0646\u062f.<\/p>\n
\n
func<\/span> CreateUserHandler<\/span>(<\/span>w<\/span> http<\/span>.<\/span>ResponseWriter<\/span>,<\/span> r<\/span> *<\/span>http<\/span>.<\/span>Request<\/span>)<\/span> {<\/span>\n    var<\/span> user<\/span> User<\/span>\n    err<\/span> :=<\/span> json<\/span>.<\/span>NewDecoder<\/span>(<\/span>r<\/span>.<\/span>Body<\/span>)<\/span>.<\/span>Decode<\/span>(<\/span>&<\/span>user<\/span>)<\/span>\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\n        w<\/span>.<\/span>WriteHeader<\/span>(<\/span>http<\/span>.<\/span>StatusBadRequest<\/span>)<\/span>\n        fmt<\/span>.<\/span>Fprintf<\/span>(<\/span>w<\/span>,<\/span> \"failed to decode request body: %v\"<\/span>,<\/span> err<\/span>)<\/span>\n        return<\/span>\n    }<\/span>\n\n    \/\/ Define validation rules<\/span>\n    rules<\/span> :=<\/span> []<\/span>validation<\/span>.<\/span>Rule<\/span>{<\/span>\n        validation<\/span>.<\/span>ValidateRequired<\/span>(<\/span>\"Name\"<\/span>,<\/span> user<\/span>.<\/span>Name<\/span>),<\/span>\n        validation<\/span>.<\/span>ValidateLength<\/span>(<\/span>\"Name\"<\/span>,<\/span> user<\/span>.<\/span>Name<\/span>,<\/span> 3<\/span>,<\/span> 50<\/span>),<\/span>\n        validation<\/span>.<\/span>ValidateEmail<\/span>(<\/span>\"Email\"<\/span>,<\/span> user<\/span>.<\/span>Email<\/span>),<\/span>\n        validation<\/span>.<\/span>ValidateRequired<\/span>(<\/span>\"Password\"<\/span>,<\/span> user<\/span>.<\/span>Password<\/span>),<\/span>\n        validation<\/span>.<\/span>ValidateLength<\/span>(<\/span>\"Password\"<\/span>,<\/span> user<\/span>.<\/span>Password<\/span>,<\/span> 8<\/span>,<\/span> 50<\/span>),<\/span>\n    }<\/span>\n\n    \/\/ Execute validation rules and get errors<\/span>\n    errors<\/span> :=<\/span> validation<\/span>.<\/span>Execute<\/span>(<\/span>rules<\/span>)<\/span>\n\n    if<\/span> len<\/span>(<\/span>errors<\/span>)<\/span> ><\/span> 0<\/span> {<\/span>\n        w<\/span>.<\/span>WriteHeader<\/span>(<\/span>http<\/span>.<\/span>StatusBadRequest<\/span>)<\/span>\n        for<\/span> _<\/span>,<\/span> err<\/span> :=<\/span> range<\/span> errors<\/span> {<\/span>\n            fmt<\/span>.<\/span>Fprintf<\/span>(<\/span>w<\/span>,<\/span> \"%s<\/span>\\n<\/span>\"<\/span>,<\/span> err<\/span>.<\/span>Error<\/span>())<\/span>\n        }<\/span>\n        return<\/span>\n    }<\/span>\n\n    \/\/ Do something with the validated user object<\/span>\n    \/\/ ...<\/span>\n}<\/span>\n<\/code><\/pre>\n
\n
\n    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n
    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n
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\u0627\u0645\u06cc\u062f\u0648\u0627\u0631\u0645 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0645\u0641\u06cc\u062f \u0628\u0648\u062f\u0647 \u0628\u0627\u0634\u062f \u0648 \u0646\u0642\u0637\u0647 \u0634\u0631\u0648\u0639 \u062e\u0648\u0628\u06cc \u0628\u0631\u0627\u06cc \u0627\u06cc\u062c\u0627\u062f \u0644\u0627\u06cc\u0647 \u0627\u0639\u062a\u0628\u0627\u0631 \u0633\u0646\u062c\u06cc \u062e\u0648\u062f \u062f\u0631 Go \u062f\u0631 \u0627\u062e\u062a\u06cc\u0627\u0631 \u0634\u0645\u0627 \u0642\u0631\u0627\u0631 \u062f\u0647\u062f.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"
\u0627\u0639\u062a\u0628\u0627\u0631 \u0633\u0646\u062c\u06cc \u0628\u062e\u0634\u06cc \u0636\u0631\u0648\u0631\u06cc \u0627\u0632 \u0647\u0631 \u0633\u06cc\u0633\u062a\u0645 \u0646\u0631\u0645 \u0627\u0641\u0632\u0627\u0631\u06cc \u0627\u0633\u062a. \u0627\u06cc\u0646 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u0627\u0637\u0645\u06cc\u0646\u0627\u0646 \u062d\u0627\u0635\u0644 \u0634\u0648\u062f \u06a9\u0647 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u067e\u0631\u062f\u0627\u0632\u0634 \u06cc\u0627 \u0630\u062e\u06cc\u0631\u0647 \u0634\u062f\u0647 \u062f\u0631 \u0633\u06cc\u0633\u062a\u0645 \u0635\u062d\u06cc\u062d \u0647\u0633\u062a\u0646\u062f \u0648 \u0645\u062d\u062f\u0648\u062f\u06cc\u062a \u0647\u0627\u06cc \u0645\u0648\u0631\u062f \u0646\u06cc\u0627\u0632 \u0631\u0627 \u0628\u0631\u0622\u0648\u0631\u062f\u0647 \u0645\u06cc \u06a9\u0646\u0646\u062f. \u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647\u060c \u0646\u062d\u0648\u0647 \u067e\u06cc\u0627\u062f\u0647\u200c\u0633\u0627\u0632\u06cc \u06cc\u06a9 \u0644\u0627\u06cc\u0647 \u0627\u0639\u062a\u0628\u0627\u0631\u0633\u0646\u062c\u06cc \u0639\u0645\u0648\u0645\u06cc \u062f\u0631 Go \u0631\u0627 \u0645\u0648\u0631\u062f \u0628\u062d\u062b \u0642\u0631\u0627\u0631 \u0645\u06cc\u200c\u062f\u0647\u06cc\u0645 \u06a9\u0647 …<\/p>\n","protected":false},"author":2,"featured_media":9825,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[339],"tags":[],"class_list":["post-9824","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dev"],"_links":{"self":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/9824","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/comments?post=9824"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/9824\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/9825"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=9824"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=9824"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=9824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}