resty_functions/scripts/combine.lua

-- 指定模块引用目录，否则无法加载同目录下的其他文件
--package.path = package.path .. ';/usr/local/opt/openresty/nginx/scripts/?.lua';
package.path = package.path .. ';<SCRIPT_PATH>/?.lua';

local uuid = require "resty.jit-uuid"
local cjson = require "cjson"
local pl = require "pl.pretty"

local http = require "resty.http"
local verify = require('lib.jwt_verify')

local httpc = http:new()
local authHeader = ngx.req.get_headers().Authorization
local sudoerToken = ngx.req.get_headers().HtySudoerToken

verify(httpc, authHeader, sudoerToken)

uuid.seed()

local file_dir = ngx.var.tmp_file_dir
ngx.req.read_body()
local req_body = cjson.decode(ngx.req.get_body_data())
ngx.log(ngx.INFO, 'REQ_BODY -> ', ngx.req.get_body_data())
local images = req_body["payload"]["images"]

local combined_uuid = uuid.generate_v4()
local output_filename = combined_uuid .. ".jpeg";
local output_filepath = file_dir .. "/" .. output_filename

local len = table.getn(images)
if len == 0 then
    ngx.status = 500
    ngx.log(ngx.ERR, "No images to combine!")
    return ;
end

local origin = {}

-- 从 nginx 变量取
local convert = ngx.var.convert

if not convert then
    ngx.status = 500
    ngx.log(ngx.ERR, "ImageMagick NOT FOUND.")
    return
end

for i = 1, len do
    ngx.log(ngx.INFO, "COMBINE FILE -> ", images[i])
    local incoming = file_dir .. "/" .. images[i]
    origin[i] = incoming .. ".png "
    local cmd = convert .. " -resize 642x1389 -strip -quality 75% " .. incoming .. " " .. origin[i]
    ngx.log(ngx.INFO, 'CMD RESIZE -> ', cmd)
    local handle = io.popen(cmd)
    local result = handle:read("*a")
    ngx.log(ngx.INFO, 'CMD RESIZE -> RESULT ', pl.dump(result))
    handle:close()

end

local cmd = convert .. " -append " .. table.concat(origin, " ") .. " " .. output_filepath
ngx.log(ngx.INFO, 'CMD APPEND -> ', cmd)
io.popen(cmd)
ngx.say(output_filename)