37 lines
1.5 KiB
Lua
37 lines
1.5 KiB
Lua
package.path = package.path .. ';<SCRIPT_PATH>/?.lua';
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local strip_path = require("lib.strip_path")
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-- filename eg. /file_upload/xxxx-xxxx-xxxx-xxxx.mp3
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local function calc_token(filename)
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-- Upyun upload parameters
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local operator = ngx.var.upyun_operator
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local password = ngx.var.upyun_password
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local bucket = ngx.var.upyun_bucket
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local directory = ngx.var.upyun_directory
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local expiration = 1800
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local method = "POST"
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local save_key = "/" .. directory .. "/" .. strip_path.strip_path(filename)
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print("save key...", save_key)
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-- Get RFC1123 data
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local date = ngx.http_time(ngx.time()) -- RFC1123 date
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print("date ...", date)
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-- Generate upyun UCT time
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local utc_time = os.time(os.date("!*t"))
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-- Calculate upyun file expiration
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expiration = utc_time + expiration
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print("expiration ...", expiration)
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-- 不能使用cjson，因为lua的table没有顺序，cjson encode出来的顺序会错乱
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local policy = string.format("{\"bucket\":\"%s\",\"save-key\":\"%s\",\"expiration\":\"%s\",\"date\":\"%s\"}", bucket, save_key, expiration, date)
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local to_be_signed = method .. "&" .. "/" .. bucket .. "&" .. date .. "&" .. ngx.encode_base64(policy)
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print("to be signed ...", to_be_signed)
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local hmac_sha1 = ngx.hmac_sha1(ngx.md5(password), to_be_signed)
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local signature = ngx.encode_base64(hmac_sha1)
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return { token = string.format("UPYUN %s:%s", operator, signature), policy = policy }
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end
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return calc_token |